20636544994956 has 108 divisors (see below), whose sum is σ = 60710769317016. Its totient is φ = 5885645610240.

The previous prime is 20636544994931. The next prime is 20636544994963. The reversal of 20636544994956 is 65949944563602.

20636544994956 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 6 + 5 + 44 + 99 + 495 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 139264150 + ... + 139412253.

Almost surely, 2^{20636544994956} is an apocalyptic number.

It is an amenable number.

20636544994956 is an abundant number, since it is smaller than the sum of its proper divisors (40074224322060).

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

20636544994956 is a wasteful number, since it uses less digits than its factorization.

20636544994956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278676452 (or 278676436 counting only the distinct ones).

The product of its (nonzero) digits is 1511654400, while the sum is 72.

The spelling of 20636544994956 in words is "twenty trillion, six hundred thirty-six billion, five hundred forty-four million, nine hundred ninety-four thousand, nine hundred fifty-six".