20756570368 has 72 divisors (see below), whose sum is σ = 43796133920. Its totient is φ = 9790709760.

The previous prime is 20756570357. The next prime is 20756570371. The reversal of 20756570368 is 86307565702.

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, 1163371 + ... + 1181077.

Almost surely, 2^20756570368 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 20756570368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21898066960).

20756570368 is an abundant number, since it is smaller than the sum of its proper divisors (23039563552).

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

20756570368 is a wasteful number, since it uses less digits than its factorization.

20756570368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17983 (or 17969 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 20756570368 in words is "twenty billion, seven hundred fifty-six million, five hundred seventy thousand, three hundred sixty-eight".