20902572 has 18 divisors (see below), whose sum is σ = 52837148. Its totient is φ = 6967512.

The previous prime is 20902529. The next prime is 20902573. The reversal of 20902572 is 27520902.

It is a happy number.

20902572 is a `hidden beast` number, since 2 + 0 + 90 + 2 + 572 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20902573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290278 + ... + 290349.

Almost surely, 2^20902572 is an apocalyptic number.

It is an amenable number.

20902572 is an abundant number, since it is smaller than the sum of its proper divisors (31934576).

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

20902572 is a wasteful number, since it uses less digits than its factorization.

20902572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580637 (or 580632 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20902572 is about 4571.9330703762. The cubic root of 20902572 is about 275.4650950560.

The spelling of 20902572 in words is "twenty million, nine hundred two thousand, five hundred seventy-two".