20508692928 has 112 divisors (see below), whose sum is σ = 55442449440. Its totient is φ = 6689193984.

The previous prime is 20508692873. The next prime is 20508692933. The reversal of 20508692928 is 82929680502.

It is a super-2 number, since 2×20508692928² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 1651350 + ... + 1663722.

It is an arithmetic number, because the mean of its divisors is an integer number (495021870).

Almost surely, 2^20508692928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20508692928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27721224720).

20508692928 is an abundant number, since it is smaller than the sum of its proper divisors (34933756512).

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

20508692928 is a wasteful number, since it uses less digits than its factorization.

20508692928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12574 (or 12564 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 20508692928 in words is "twenty billion, five hundred eight million, six hundred ninety-two thousand, nine hundred twenty-eight".