20320321331 has 2 divisors, whose sum is σ = 20320321332. Its totient is φ = 20320321330.

The previous prime is 20320321309. The next prime is 20320321349. The reversal of 20320321331 is 13312302302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320321331 - 2¹⁸ = 20320059187 is a prime.

It is a super-2 number, since 2×20320321331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20320321031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160160665 + 10160160666.

It is an arithmetic number, because the mean of its divisors is an integer number (10160160666).

Almost surely, 2^20320321331 is an apocalyptic number.

20320321331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320321331 is an equidigital number, since it uses as much as digits as its factorization.

20320321331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20320321331 its reverse (13312302302), we get a palindrome (33632623633).

The spelling of 20320321331 in words is "twenty billion, three hundred twenty million, three hundred twenty-one thousand, three hundred thirty-one".