320020331 has 2 divisors, whose sum is σ = 320020332. Its totient is φ = 320020330.

The previous prime is 320020313. The next prime is 320020339. The reversal of 320020331 is 133020023.

Together with previous prime (320020313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320020331 is a prime.

It is a super-2 number, since 2×320020331² = 204826024506699122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320020339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160010165 + 160010166.

It is an arithmetic number, because the mean of its divisors is an integer number (160010166).

Almost surely, 2^320020331 is an apocalyptic number.

320020331 is a deficient number, since it is larger than the sum of its proper divisors (1).

320020331 is an equidigital number, since it uses as much as digits as its factorization.

320020331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 320020331 is about 17889.1120796981. The cubic root of 320020331 is about 684.0048639976.

Adding to 320020331 its reverse (133020023), we get a palindrome (453040354).

The spelling of 320020331 in words is "three hundred twenty million, twenty thousand, three hundred thirty-one".