20312031 has 16 divisors (see below), whose sum is σ = 27694944. Its totient is φ = 13238784.

The previous prime is 20312021. The next prime is 20312053. The reversal of 20312031 is 13021302.

It is a happy number.

It is not a de Polignac number, because 20312031 - 2⁷ = 20311903 is a prime.

It is a super-2 number, since 2×20312031² = 825157206689922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20311998 and 20312016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312021) 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 15 ways as a sum of consecutive naturals, for example, 29665 + ... + 30341.

It is an arithmetic number, because the mean of its divisors is an integer number (1730934).

Almost surely, 2^20312031 is an apocalyptic number.

20312031 is a deficient number, since it is larger than the sum of its proper divisors (7382913).

20312031 is a wasteful number, since it uses less digits than its factorization.

20312031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20312031 is about 4506.8870631512. The cubic root of 20312031 is about 272.8461207973.

Adding to 20312031 its reverse (13021302), we get a palindrome (33333333).

The spelling of 20312031 in words is "twenty million, three hundred twelve thousand, thirty-one".