20031131233231 has 8 divisors (see below), whose sum is σ = 20077892651520. Its totient is φ = 19984406828568.

The previous prime is 20031131233219. The next prime is 20031131233247. The reversal of 20031131233231 is 13233213113002.

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 20031131233231 - 2¹¹ = 20031131231183 is a prime.

It is a super-2 number, since 2×20031131233231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031131233196 and 20031131233205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031131233031) 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, 8169631 + ... + 10334656.

It is an arithmetic number, because the mean of its divisors is an integer number (2509736581440).

Almost surely, 2^{20031131233231} is an apocalyptic number.

20031131233231 is a deficient number, since it is larger than the sum of its proper divisors (46761418289).

20031131233231 is a wasteful number, since it uses less digits than its factorization.

20031131233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18506813.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 20031131233231 its reverse (13233213113002), we get a palindrome (33264344346233).

The spelling of 20031131233231 in words is "twenty trillion, thirty-one billion, one hundred thirty-one million, two hundred thirty-three thousand, two hundred thirty-one".