20812708 has 36 divisors (see below), whose sum is σ = 42591360. Its totient is φ = 8716032.

The previous prime is 20812703. The next prime is 20812717. The reversal of 20812708 is 80721802.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20812703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214516 + ... + 214612.

Almost surely, 2^20812708 is an apocalyptic number.

20812708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20812708 is an abundant number, since it is smaller than the sum of its proper divisors (21778652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20812708 is an equidigital number, since it uses as much as digits as its factorization.

20812708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 20812708 is about 4562.0946943263. The cubic root of 20812708 is about 275.0697696252.

The spelling of 20812708 in words is "twenty million, eight hundred twelve thousand, seven hundred eight".