20975188 has 12 divisors (see below), whose sum is σ = 39530260. Its totient is φ = 9680832.

The previous prime is 20975167. The next prime is 20975191. The reversal of 20975188 is 88157902.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 6822544 = 3762^2 + 2612^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20975188.

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, 201633 + ... + 201736.

Almost surely, 2^20975188 is an apocalyptic number.

It is an amenable number.

20975188 is a deficient number, since it is larger than the sum of its proper divisors (18555072).

20975188 is a wasteful number, since it uses less digits than its factorization.

20975188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403386 (or 403384 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 20975188 is about 4579.8676836782. The cubic root of 20975188 is about 275.7837169960.

The spelling of 20975188 in words is "twenty million, nine hundred seventy-five thousand, one hundred eighty-eight".