320020531 has 2 divisors, whose sum is σ = 320020532. Its totient is φ = 320020530.

The previous prime is 320020499. The next prime is 320020537. The reversal of 320020531 is 135020023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320020531 - 2⁵ = 320020499 is a prime.

It is a super-2 number, since 2×320020531² = 204826280523043922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320020537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160010265 + 160010266.

It is an arithmetic number, because the mean of its divisors is an integer number (160010266).

Almost surely, 2^320020531 is an apocalyptic number.

320020531 is a deficient number, since it is larger than the sum of its proper divisors (1).

320020531 is an equidigital number, since it uses as much as digits as its factorization.

320020531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 320020531 is about 17889.1176696896. The cubic root of 320020531 is about 684.0050064896.

Adding to 320020531 its reverse (135020023), we get a palindrome (455040554).

The spelling of 320020531 in words is "three hundred twenty million, twenty thousand, five hundred thirty-one".