20872161996 has 48 divisors (see below), whose sum is σ = 57578384640. Its totient is φ = 5757837120.

The previous prime is 20872161953. The next prime is 20872162001. The reversal of 20872161996 is 69916127802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4281670 + ... + 4286541.

It is an arithmetic number, because the mean of its divisors is an integer number (1199549680).

Almost surely, 2^20872161996 is an apocalyptic number.

It is an amenable number.

20872161996 is an abundant number, since it is smaller than the sum of its proper divisors (36706222644).

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

20872161996 is a wasteful number, since it uses less digits than its factorization.

20872161996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568254 (or 8568252 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 20872161996 in words is "twenty billion, eight hundred seventy-two million, one hundred sixty-one thousand, nine hundred ninety-six".