20311321031 has 4 divisors (see below), whose sum is σ = 20342049864. Its totient is φ = 20280592200.

The previous prime is 20311321021. The next prime is 20311321039. The reversal of 20311321031 is 13012311302.

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 20311321031 - 2²⁶ = 20244212167 is a prime.

It is a super-2 number, since 2×20311321031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311321039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15363425 + ... + 15364746.

It is an arithmetic number, because the mean of its divisors is an integer number (5085512466).

Almost surely, 2^20311321031 is an apocalyptic number.

20311321031 is a deficient number, since it is larger than the sum of its proper divisors (30728833).

20311321031 is an equidigital number, since it uses as much as digits as its factorization.

20311321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30728832.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20311321031 its reverse (13012311302), we get a palindrome (33323632333).

The spelling of 20311321031 in words is "twenty billion, three hundred eleven million, three hundred twenty-one thousand, thirty-one".