20879967936 has 84 divisors (see below), whose sum is σ = 58685930888. Its totient is φ = 6550560768.

The previous prime is 20879967931. The next prime is 20879967961. The reversal of 20879967936 is 63976997802.

It is a happy number.

It is a super-2 number, since 2×20879967936² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20879967931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132661 + ... + 243636.

Almost surely, 2^20879967936 is an apocalyptic number.

It is an amenable number.

20879967936 is an abundant number, since it is smaller than the sum of its proper divisors (37805962952).

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

20879967936 is a wasteful number, since it uses less digits than its factorization.

20879967936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376346 (or 376319 counting only the distinct ones).

The product of its (nonzero) digits is 61725888, while the sum is 66.

The spelling of 20879967936 in words is "twenty billion, eight hundred seventy-nine million, nine hundred sixty-seven thousand, nine hundred thirty-six".