20320312331 has 4 divisors (see below), whose sum is σ = 22167613464. Its totient is φ = 18473011200.

The previous prime is 20320312321. The next prime is 20320312333. The reversal of 20320312331 is 13321302302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20320312331 - 2³⁰ = 19246570507 is a prime.

It is a super-2 number, since 2×20320312331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320312333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923650550 + ... + 923650571.

It is an arithmetic number, because the mean of its divisors is an integer number (5541903366).

Almost surely, 2^20320312331 is an apocalyptic number.

20320312331 is a deficient number, since it is larger than the sum of its proper divisors (1847301133).

20320312331 is a wasteful number, since it uses less digits than its factorization.

20320312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847301132.

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

Adding to 20320312331 its reverse (13321302302), we get a palindrome (33641614633).

The spelling of 20320312331 in words is "twenty billion, three hundred twenty million, three hundred twelve thousand, three hundred thirty-one".