2020 is "autobiographical" -- the first digit tells how many 0s are in the number, the second digit tells how many 1s are in the number, etc. The next autobiographical year will be 21200. Can you find a 10-digit autobiographical number?
It's a Harshad number because it is divisible by the sum of its digits.
Add 2020 to its reversal 0202 and you get 2222
It is a polite number because it can be written as the sum of consecutive integers. For example, 2020 = 31 + 32 + 33 + ... + 70