20556121632562 has 16 divisors (see below), whose sum is σ = 30862601753184. Its totient is φ = 10268589240000.

The previous prime is 20556121632559. The next prime is 20556121632581. The reversal of 20556121632562 is 26523612165502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27034237 + ... + 27784207.

It is an arithmetic number, because the mean of its divisors is an integer number (1928912609574).

Almost surely, 2^{20556121632562} is an apocalyptic number.

20556121632562 is a deficient number, since it is larger than the sum of its proper divisors (10306480120622).

20556121632562 is a wasteful number, since it uses less digits than its factorization.

20556121632562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762585.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 20556121632562 in words is "twenty trillion, five hundred fifty-six billion, one hundred twenty-one million, six hundred thirty-two thousand, five hundred sixty-two".