20320564023 has 12 divisors (see below), whose sum is σ = 29353732408. Its totient is φ = 13546208880.

The previous prime is 20320563971. The next prime is 20320564039. The reversal of 20320564023 is 32046502302.

20320564023 is a `hidden beast` number, since 203 + 2 + 0 + 56 + 402 + 3 = 666.

It is not a de Polignac number, because 20320564023 - 2⁹ = 20320563511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320564093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108993 + ... + 229173.

Almost surely, 2^20320564023 is an apocalyptic number.

20320564023 is a deficient number, since it is larger than the sum of its proper divisors (9033168385).

20320564023 is a wasteful number, since it uses less digits than its factorization.

20320564023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138974 (or 138971 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The spelling of 20320564023 in words is "twenty billion, three hundred twenty million, five hundred sixty-four thousand, twenty-three".