20331031 has 12 divisors (see below), whose sum is σ = 25042608. Its totient is φ = 16400832.

The previous prime is 20331023. The next prime is 20331043. The reversal of 20331031 is 13013302.

It is not a de Polignac number, because 20331031 - 2³ = 20331023 is a prime.

It is a super-2 number, since 2×20331031² = 826701643045922, which 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 (20331061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11371 + ... + 13036.

It is an arithmetic number, because the mean of its divisors is an integer number (2086884).

Almost surely, 2^20331031 is an apocalyptic number.

20331031 is a deficient number, since it is larger than the sum of its proper divisors (4711577).

20331031 is a wasteful number, since it uses less digits than its factorization.

20331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24438 (or 24431 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 20331031 is about 4508.9944555300. The cubic root of 20331031 is about 272.9311682703.

Adding to 20331031 its reverse (13013302), we get a palindrome (33344333).

The spelling of 20331031 in words is "twenty million, three hundred thirty-one thousand, thirty-one".