20323645656 has 32 divisors (see below), whose sum is σ = 53797886640. Its totient is φ = 6376045568.

The previous prime is 20323645637. The next prime is 20323645679. The reversal of 20323645656 is 65654632302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24906021 + ... + 24906836.

Almost surely, 2^20323645656 is an apocalyptic number.

It is an amenable number.

20323645656 is an abundant number, since it is smaller than the sum of its proper divisors (33474240984).

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

20323645656 is a wasteful number, since it uses less digits than its factorization.

20323645656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49812883 (or 49812879 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 20323645656 in words is "twenty billion, three hundred twenty-three million, six hundred forty-five thousand, six hundred fifty-six".