20321310031 has 8 divisors (see below), whose sum is σ = 22351915728. Its totient is φ = 18473917000.

The previous prime is 20321310029. The next prime is 20321310071. The reversal of 20321310031 is 13001312302.

It is not a de Polignac number, because 20321310031 - 2¹ = 20321310029 is a prime.

It is a super-2 number, since 2×20321310031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321309987 and 20321310014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321310001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7632520 + ... + 7635181.

It is an arithmetic number, because the mean of its divisors is an integer number (2793989466).

Almost surely, 2^20321310031 is an apocalyptic number.

20321310031 is a deficient number, since it is larger than the sum of its proper divisors (2030605697).

20321310031 is an equidigital number, since it uses as much as digits as its factorization.

20321310031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15267734 (or 15267712 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20321310031 its reverse (13001312302), we get a palindrome (33322622333).

The spelling of 20321310031 in words is "twenty billion, three hundred twenty-one million, three hundred ten thousand, thirty-one".