320204857 has 12 divisors (see below), whose sum is σ = 376328820. Its totient is φ = 271627776.

The previous prime is 320204849. The next prime is 320204869. The reversal of 320204857 is 758402023.

It can be written as a sum of positive squares in 2 ways, for example, as 45441081 + 274763776 = 6741^2 + 16576^2 .

It is not a de Polignac number, because 320204857 - 2³ = 320204849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320204557) 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, 28932 + ... + 38437.

It is an arithmetic number, because the mean of its divisors is an integer number (31360735).

Almost surely, 2^320204857 is an apocalyptic number.

It is an amenable number.

320204857 is a deficient number, since it is larger than the sum of its proper divisors (56123963).

320204857 is an equidigital number, since it uses as much as digits as its factorization.

320204857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67480 (or 67473 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 320204857 is about 17894.2688311090. The cubic root of 320204857 is about 684.1363060946.

The spelling of 320204857 in words is "three hundred twenty million, two hundred four thousand, eight hundred fifty-seven".