20651634256 has 20 divisors (see below), whose sum is σ = 43650045504. Its totient is φ = 9387106400.

The previous prime is 20651634247. The next prime is 20651634257. The reversal of 20651634256 is 65243615602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651634257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58669240 + ... + 58669591.

Almost surely, 2^20651634256 is an apocalyptic number.

It is an amenable number.

20651634256 is an abundant number, since it is smaller than the sum of its proper divisors (22998411248).

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

20651634256 is a wasteful number, since it uses less digits than its factorization.

20651634256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117338850 (or 117338844 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20651634256 in words is "twenty billion, six hundred fifty-one million, six hundred thirty-four thousand, two hundred fifty-six".