20459988928 has 56 divisors (see below), whose sum is σ = 43350899328. Its totient is φ = 9557619456.

The previous prime is 20459988919. The next prime is 20459988947. The reversal of 20459988928 is 82988995402.

It is a super-2 number, since 2×20459988928² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 20459988928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98326 + ... + 224917.

Almost surely, 2^20459988928 is an apocalyptic number.

It is an amenable number.

20459988928 is an abundant number, since it is smaller than the sum of its proper divisors (22890910400).

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

20459988928 is a wasteful number, since it uses less digits than its factorization.

20459988928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323321 (or 323311 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 64.

The spelling of 20459988928 in words is "twenty billion, four hundred fifty-nine million, nine hundred eighty-eight thousand, nine hundred twenty-eight".