20031131104 has 12 divisors (see below), whose sum is σ = 39436289424. Its totient is φ = 10015565536.

The previous prime is 20031131101. The next prime is 20031131117. The reversal of 20031131104 is 40113113002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031131101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312986392 + ... + 312986455.

It is an arithmetic number, because the mean of its divisors is an integer number (3286357452).

Almost surely, 2^20031131104 is an apocalyptic number.

It is an amenable number.

20031131104 is a deficient number, since it is larger than the sum of its proper divisors (19405158320).

20031131104 is an equidigital number, since it uses as much as digits as its factorization.

20031131104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625972857 (or 625972849 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20031131104 its reverse (40113113002), we get a palindrome (60144244106).

The spelling of 20031131104 in words is "twenty billion, thirty-one million, one hundred thirty-one thousand, one hundred four".