20425615656 has 16 divisors (see below), whose sum is σ = 51064039200. Its totient is φ = 6808538544.

The previous prime is 20425615607. The next prime is 20425615667. The reversal of 20425615656 is 65651652402.

It is a happy 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, 425533636 + ... + 425533683.

It is an arithmetic number, because the mean of its divisors is an integer number (3191502450).

Almost surely, 2^20425615656 is an apocalyptic number.

It is an amenable number.

20425615656 is an abundant number, since it is smaller than the sum of its proper divisors (30638423544).

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

20425615656 is a wasteful number, since it uses less digits than its factorization.

20425615656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851067328 (or 851067324 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

It can be divided in two parts, 204256 and 15656, that added together give a palindrome (219912).

The spelling of 20425615656 in words is "twenty billion, four hundred twenty-five million, six hundred fifteen thousand, six hundred fifty-six".