20972308 has 12 divisors (see below), whose sum is σ = 41944672. Its totient is φ = 8988120.

The previous prime is 20972291. The next prime is 20972311. The reversal of 20972308 is 80327902.

20972308 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20972308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374478 + ... + 374533.

Almost surely, 2^20972308 is an apocalyptic number.

20972308 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20972308 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20972308 is a wasteful number, since it uses less digits than its factorization.

20972308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749022 (or 749020 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20972308 is about 4579.5532533207. The cubic root of 20972308 is about 275.7710942492.

The spelling of 20972308 in words is "twenty million, nine hundred seventy-two thousand, three hundred eight".