20318512768 has 32 divisors (see below), whose sum is σ = 40690264320. Its totient is φ = 10106054400.

The previous prime is 20318512757. The next prime is 20318512787. The reversal of 20318512768 is 86721581302.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×20318512768² (a number of 21 digits) contains 22 as substring.

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, 391098 + ... + 439993.

It is an arithmetic number, because the mean of its divisors is an integer number (1271570760).

Almost surely, 2^20318512768 is an apocalyptic number.

It is an amenable number.

20318512768 is an abundant number, since it is smaller than the sum of its proper divisors (20371751552).

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

20318512768 is an equidigital number, since it uses as much as digits as its factorization.

20318512768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831296 (or 831284 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 20318512768 in words is "twenty billion, three hundred eighteen million, five hundred twelve thousand, seven hundred sixty-eight".