20706891564 has 96 divisors (see below), whose sum is σ = 50534313984. Its totient is φ = 6591836160.

The previous prime is 20706891479. The next prime is 20706891571. The reversal of 20706891564 is 46519860702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11054532 + ... + 11056404.

It is an arithmetic number, because the mean of its divisors is an integer number (526399104).

Almost surely, 2^20706891564 is an apocalyptic number.

It is an amenable number.

20706891564 is an abundant number, since it is smaller than the sum of its proper divisors (29827422420).

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

20706891564 is a wasteful number, since it uses less digits than its factorization.

20706891564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287 (or 2285 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 20706891564 in words is "twenty billion, seven hundred six million, eight hundred ninety-one thousand, five hundred sixty-four".