20856444704 has 24 divisors (see below), whose sum is σ = 43222238640. Its totient is φ = 9879368256.

The previous prime is 20856444649. The next prime is 20856444731. The reversal of 20856444704 is 40744465802.

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, 17151074 + ... + 17152289.

It is an arithmetic number, because the mean of its divisors is an integer number (1800926610).

Almost surely, 2^20856444704 is an apocalyptic number.

It is an amenable number.

20856444704 is an abundant number, since it is smaller than the sum of its proper divisors (22365793936).

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

20856444704 is a wasteful number, since it uses less digits than its factorization.

20856444704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34303392 (or 34303384 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 44.

The spelling of 20856444704 in words is "twenty billion, eight hundred fifty-six million, four hundred forty-four thousand, seven hundred four".