20689552256 has 32 divisors (see below), whose sum is σ = 42331462680. Its totient is φ = 10065185280.

The previous prime is 20689552199. The next prime is 20689552267. The reversal of 20689552256 is 65225598602.

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

It is a congruent number.

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, 2179550 + ... + 2189021.

Almost surely, 2^20689552256 is an apocalyptic number.

It is an amenable number.

20689552256 is an abundant number, since it is smaller than the sum of its proper divisors (21641910424).

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

20689552256 is an equidigital number, since it uses as much as digits as its factorization.

20689552256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368622 (or 4368610 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 20689552256 in words is "twenty billion, six hundred eighty-nine million, five hundred fifty-two thousand, two hundred fifty-six".