20203131231 has 12 divisors (see below), whose sum is σ = 29211583752. Its totient is φ = 13455238896.

The previous prime is 20203131229. The next prime is 20203131251. The reversal of 20203131231 is 13213130202.

It is not a de Polignac number, because 20203131231 - 2¹ = 20203131229 is a prime.

It is a super-2 number, since 2×20203131231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203131251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1116801 + ... + 1134746.

It is an arithmetic number, because the mean of its divisors is an integer number (2434298646).

Almost surely, 2^20203131231 is an apocalyptic number.

20203131231 is a deficient number, since it is larger than the sum of its proper divisors (9008452521).

20203131231 is a wasteful number, since it uses less digits than its factorization.

20203131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252550 (or 2252547 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20203131231 its reverse (13213130202), we get a palindrome (33416261433).

The spelling of 20203131231 in words is "twenty billion, two hundred three million, one hundred thirty-one thousand, two hundred thirty-one".