20556364 has 12 divisors (see below), whose sum is σ = 36190224. Its totient is φ = 10216304.

The previous prime is 20556307. The next prime is 20556391. The reversal of 20556364 is 46365502.

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, 14719 + ... + 16054.

It is an arithmetic number, because the mean of its divisors is an integer number (3015852).

Almost surely, 2^20556364 is an apocalyptic number.

It is an amenable number.

20556364 is a deficient number, since it is larger than the sum of its proper divisors (15633860).

20556364 is a wasteful number, since it uses less digits than its factorization.

20556364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30944 (or 30942 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 20556364 is about 4533.9126590617. The cubic root of 20556364 is about 273.9357833419.

The spelling of 20556364 in words is "twenty million, five hundred fifty-six thousand, three hundred sixty-four".