20651872108 has 12 divisors (see below), whose sum is σ = 41303744272. Its totient is φ = 8850802320.

The previous prime is 20651872097. The next prime is 20651872133. The reversal of 20651872108 is 80127815602.

20651872108 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368783403 + ... + 368783458.

Almost surely, 2^20651872108 is an apocalyptic number.

20651872108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20651872108 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20651872108 is a wasteful number, since it uses less digits than its factorization.

20651872108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737566872 (or 737566870 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 20651872108 in words is "twenty billion, six hundred fifty-one million, eight hundred seventy-two thousand, one hundred eight".