20638811016 has 40 divisors (see below), whose sum is σ = 57807782670. Its totient is φ = 6879603456.

The previous prime is 20638811003. The next prime is 20638811027. The reversal of 20638811016 is 61011883602.

20638811016 is a `hidden beast` number, since 2 + 0 + 638 + 8 + 1 + 1 + 0 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19475318916 + 1163492100 = 139554^2 + 34110^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15924361 + ... + 15925656.

Almost surely, 2^20638811016 is an apocalyptic number.

It is an amenable number.

20638811016 is an abundant number, since it is smaller than the sum of its proper divisors (37168971654).

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

20638811016 is a wasteful number, since it uses less digits than its factorization.

20638811016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31850035 (or 31850022 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 20638811016 in words is "twenty billion, six hundred thirty-eight million, eight hundred eleven thousand, sixteen".