Numbers 23,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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23,019

[Math.]  230192 = 529,874,361, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

23,040

[Math.]  Sum (in degrees) of all internal angles of a 130-side polygon.

 

[Measure]  The number of acres in a township.

U.S. customary units for area measures: 1 acre = 160 square rods = 4,840 square yards = 43,560 square feet = 6,272,640 square inches = 4046.8564224 m2 & 1 square mile (1 section) = 640 acres = 2,589,988.11 m2 = 2.59 km2 = 259 hectares & 1 hectare = 2.471 acres = 10,000 m2 & 1 township = 36 square miles.

 

23,058

[Math.]  Two multiples of number 3294, 3294×6 = 19,764 and 3294×7 = 23,058, use each of 10 digits 0-9 once.

 

23,079

[Math.]  Two multiples of number 3297, 3297×7 = 16,485 and 3297×7 = 23,079, use each of 10 digits 0-9 once.

 

23,095

[Math.]  Two multiples of number 4619, 4619×4 = 18,476 and 4619×5 = 23,095, use each of 10 digits 0-9 once.

 

23,113

[Math.]  231132 = 534,210,769, a square using all 9 digits 0-9 once, except digit 8.

 

23,142

[Math.]  Two consecutive sums of consecutive numbers:

784+785+…+812 = 813+814+…+840 = 23,142.

 

23,145

[Theology]  There are 31103 verses in the Holy Bible: 23145 verses in Old Testament and 7958 in New Testament (plus 137 un-numbered verses in Psalms).

 

23,178

[Math.]  231782 = 537,219,684, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

 

23,184

[Math.]  Each ratio 15768/3942 = 17568/4392 = 23184/5796 = 31824/7956 = 4, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #4.

 

23,209

[Math.]  A prime number.  A Mersenne exponent: 223209–1 is the 26th Mersenne prime number.

 

23,222, 23,223, 23,232, 23,233, 23,322 & 23,323

[Zip]  U.S. Postal Zip Code: Richmond, Virginia 23222,  23,223, 23,232, 23,233, 23,322 & 23,323 (3 digits 2 and 2 digits 3 or 3 digits 3 and 2 digits 2

(3 digits 2 and 2 digits 3).

 

23,333 & 23339

[Math.]  A right-truncatable prime number: self, 2333, 233, 23 and 3 are prime numbers.

 

23,399

[Math.]  A right-truncatable prime number: self, 2339, 233, 23 and 2 are prime numbers.

 

23,409

[Math.]  Sum of the first 17 cube numbers:

13+23+33+…+153+163+173 = 23, 409 = (1+2+3+…+15+16+17)2 = 1532.

 

23,439

[Math.]  234392 = 549,386,721, one of thirty 9-digit square numbers using each of 9 digits 1-9 once.

  

23,660 & 23,661

[Math.]  The 6th square number that is the sum of squares of 2 consecutive numbers: 334612 = 1,119,638,521 = 236602+236612. Each root number in the series is 6 times the previous root number minus the earlier root number: 1, 52, 292, 1692, 9852

Or in other words: 

(23660, 23661, 33461) is the 6th Pythagorean triple (lengths of 3 sides of a right triangle), where 2 sides are consecutive integers.

 

23,671

[Math.]  The largest prime number whose digits are distinct and in the English alphabetical backward consecutive order.

 

23,675

[Math.]  Two multiples of number 4735, 4735×4 = 18,940 and 4735×5 = 23,675, use each of 10 digits 0-9 once.

 

23,682

[Math.]  236822 = 560,837,124, one of 22 squares using all 9 digits 0-8 once.

 

23,705

[Math.]  Two multiples of number 4741, 4741×4 = 18,964 and 4741×5 = 23,705, use each of 10 digits 0-9 once.

  

23,715

[Math.]  Two multiples of number 4743, 4743×2 = 9486 and 4743×5 = 23,715, use each of 9 digits 1-9 once.

 

23,716

[Math.]  Three square numbers using the same digits: 1542 = 23716, 1812 = 32761 and 2692 = 72361.

 

23,728

[Math.]  237282 = 563,017,984, a square using all 9 digits 0-9 once, except digit 2.

 

23,845

[Math.]  Two multiples of number 4769, 4769×4 = 19,076 and 4769×5 = 23,845, use each of 10 digits 0-9 once.

 

23,889

[Math.]  238892 = 570,684,321, one of 22 squares using all 9 digits 0-8 once.

 

23,993

[Math.]  A right-truncatable prime number: self, 2399, 239, 23 and 2 are prime numbers.

 

23nnn

[Zip]  U.S. Postal Zip Codes of Virginia: 22nnn-23nnn, 240nn-246nn and 201nn.