20320864 has 24 divisors (see below), whose sum is σ = 40559400. Its totient is φ = 10020096.

The previous prime is 20320849. The next prime is 20320877. The reversal of 20320864 is 46802302.

It is a happy number.

It is a congruent 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, 2014 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (1689975).

Almost surely, 2^20320864 is an apocalyptic number.

It is an amenable number.

20320864 is a deficient number, since it is larger than the sum of its proper divisors (20238536).

20320864 is an equidigital number, since it uses as much as digits as its factorization.

20320864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8782 (or 8774 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20320864 is about 4507.8669013182. The cubic root of 20320864 is about 272.8856655137.

The spelling of 20320864 in words is "twenty million, three hundred twenty thousand, eight hundred sixty-four".