20188902 has 32 divisors (see below), whose sum is σ = 41762304. Its totient is φ = 6501600.

The previous prime is 20188879. The next prime is 20188907. The reversal of 20188902 is 20988102.

It is a self number, because there is not a number n which added to its sum of digits gives 20188902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188907) 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, 46627 + ... + 47057.

It is an arithmetic number, because the mean of its divisors is an integer number (1305072).

Almost surely, 2^20188902 is an apocalyptic number.

20188902 is an abundant number, since it is smaller than the sum of its proper divisors (21573402).

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

20188902 is a wasteful number, since it uses less digits than its factorization.

20188902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

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

The square root of 20188902 is about 4493.2062049276. The cubic root of 20188902 is about 272.2936832953.

The spelling of 20188902 in words is "twenty million, one hundred eighty-eight thousand, nine hundred two".