20031131231 has 8 divisors (see below), whose sum is σ = 20113649280. Its totient is φ = 19948770072.

The previous prime is 20031131221. The next prime is 20031131233. The reversal of 20031131231 is 13213113002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20031131231 - 2⁶ = 20031131167 is a prime.

It is a super-2 number, since 2×20031131231² (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 (20031131233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220166 + ... + 297548.

It is an arithmetic number, because the mean of its divisors is an integer number (2514206160).

Almost surely, 2^20031131231 is an apocalyptic number.

20031131231 is a deficient number, since it is larger than the sum of its proper divisors (82518049).

20031131231 is an equidigital number, since it uses as much as digits as its factorization.

20031131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78445.

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

Adding to 20031131231 its reverse (13213113002), we get a palindrome (33244244233).

The spelling of 20031131231 in words is "twenty billion, thirty-one million, one hundred thirty-one thousand, two hundred thirty-one".