20637264011521 has 32 divisors (see below), whose sum is σ = 21890418278400. Its totient is φ = 19417133381184.

The previous prime is 20637264011491. The next prime is 20637264011563. The reversal of 20637264011521 is 12511046273602.

It is a cyclic number.

It is not a de Polignac number, because 20637264011521 - 2⁹ = 20637264011009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20637264011921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164439231 + ... + 164564683.

It is an arithmetic number, because the mean of its divisors is an integer number (684075571200).

Almost surely, 2^{20637264011521} is an apocalyptic number.

It is an amenable number.

20637264011521 is a deficient number, since it is larger than the sum of its proper divisors (1253154266879).

20637264011521 is a wasteful number, since it uses less digits than its factorization.

20637264011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126085.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 20637264011521 in words is "twenty trillion, six hundred thirty-seven billion, two hundred sixty-four million, eleven thousand, five hundred twenty-one".