20113231031 has 4 divisors (see below), whose sum is σ = 20113528512. Its totient is φ = 20112933552.

The previous prime is 20113231027. The next prime is 20113231057. The reversal of 20113231031 is 13013231102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20113231031 - 2² = 20113231027 is a prime.

It is a super-2 number, since 2×20113231031² (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 (20113231081) 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, 7115 + ... + 200691.

It is an arithmetic number, because the mean of its divisors is an integer number (5028382128).

Almost surely, 2^20113231031 is an apocalyptic number.

20113231031 is a deficient number, since it is larger than the sum of its proper divisors (297481).

20113231031 is a wasteful number, since it uses less digits than its factorization.

20113231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297480.

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

Adding to 20113231031 its reverse (13013231102), we get a palindrome (33126462133).

The spelling of 20113231031 in words is "twenty billion, one hundred thirteen million, two hundred thirty-one thousand, thirty-one".