20556602636504 has 64 divisors (see below), whose sum is σ = 43499576966400. Its totient is φ = 9021278492800.

The previous prime is 20556602636477. The next prime is 20556602636513. The reversal of 20556602636504 is 40563620665502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56961959 + ... + 57321705.

It is an arithmetic number, because the mean of its divisors is an integer number (679680890100).

Almost surely, 2^{20556602636504} is an apocalyptic number.

It is an amenable number.

20556602636504 is an abundant number, since it is smaller than the sum of its proper divisors (22942974329896).

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

20556602636504 is a wasteful number, since it uses less digits than its factorization.

20556602636504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382184 (or 382180 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 20556602636504 in words is "twenty trillion, five hundred fifty-six billion, six hundred two million, six hundred thirty-six thousand, five hundred four".