20031131023 has 4 divisors (see below), whose sum is σ = 20032906768. Its totient is φ = 20029355280.

The previous prime is 20031131009. The next prime is 20031131033. The reversal of 20031131023 is 32013113002.

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 20031131023 - 2¹⁷ = 20030999951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031130988 and 20031131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031131033) 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, 870843 + ... + 893548.

It is an arithmetic number, because the mean of its divisors is an integer number (5008226692).

Almost surely, 2^20031131023 is an apocalyptic number.

20031131023 is a deficient number, since it is larger than the sum of its proper divisors (1775745).

20031131023 is a wasteful number, since it uses less digits than its factorization.

20031131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775744.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20031131023 its reverse (32013113002), we get a palindrome (52044244025).

The spelling of 20031131023 in words is "twenty billion, thirty-one million, one hundred thirty-one thousand, twenty-three".