20902188 has 48 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 6715584.

The previous prime is 20902181. The next prime is 20902237. The reversal of 20902188 is 88120902.

It is not an unprimeable number, because it can be changed into a prime (20902181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79345 + ... + 79607.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360).

Almost surely, 2^20902188 is an apocalyptic number.

It is an amenable number.

20902188 is an abundant number, since it is smaller than the sum of its proper divisors (29659092).

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

20902188 is a wasteful number, since it uses less digits than its factorization.

20902188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20902188 is about 4571.8910748179. The cubic root of 20902188 is about 275.4634081943.

It can be divided in two parts, 2090 and 2188, that added together give a triangular number (4278 = T₉₂).

The spelling of 20902188 in words is "twenty million, nine hundred two thousand, one hundred eighty-eight".