20317523904 has 84 divisors (see below), whose sum is σ = 58371725776. Its totient is φ = 6756784128.

The previous prime is 20317523887. The next prime is 20317523911. The reversal of 20317523904 is 40932571302.

20317523904 is a `hidden beast` number, since 203 + 17 + 52 + 390 + 4 = 666.

It is a super-2 number, since 2×20317523904² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208677 + ... + 290139.

Almost surely, 2^20317523904 is an apocalyptic number.

20317523904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20317523904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29185862888).

20317523904 is an abundant number, since it is smaller than the sum of its proper divisors (38054201872).

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

20317523904 is a wasteful number, since it uses less digits than its factorization.

20317523904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81914 (or 81901 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 20317523904 in words is "twenty billion, three hundred seventeen million, five hundred twenty-three thousand, nine hundred four".