20902872 has 16 divisors (see below), whose sum is σ = 52257240. Its totient is φ = 6967616.

The previous prime is 20902813. The next prime is 20902873. The reversal of 20902872 is 27820902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20902873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435453 + ... + 435500.

Almost surely, 2^20902872 is an apocalyptic number.

It is an amenable number.

20902872 is an abundant number, since it is smaller than the sum of its proper divisors (31354368).

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

20902872 is a wasteful number, since it uses less digits than its factorization.

20902872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870962 (or 870958 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20902872 is about 4571.9658791378. The cubic root of 20902872 is about 275.4664129023.

The spelling of 20902872 in words is "twenty million, nine hundred two thousand, eight hundred seventy-two".