20320664575 has 6 divisors (see below), whose sum is σ = 25197624104. Its totient is φ = 16256531640.

The previous prime is 20320664569. The next prime is 20320664627. The reversal of 20320664575 is 57546602302.

It is not a de Polignac number, because 20320664575 - 2⁵ = 20320664543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406413267 + ... + 406413316.

Almost surely, 2^20320664575 is an apocalyptic number.

20320664575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20320664575 is a deficient number, since it is larger than the sum of its proper divisors (4876959529).

20320664575 is an equidigital number, since it uses as much as digits as its factorization.

20320664575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812826593 (or 812826588 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 20320664575 in words is "twenty billion, three hundred twenty million, six hundred sixty-four thousand, five hundred seventy-five".