20113131031123 has 16 divisors (see below), whose sum is σ = 22121498198016. Its totient is φ = 18170662396320.

The previous prime is 20113131031061. The next prime is 20113131031127. The reversal of 20113131031123 is 32113013131102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20113131031123 is a prime.

It is a super-2 number, since 2×20113131031123² (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 = 20113131031094 and 20113131031103.

It is not an unprimeable number, because it can be changed into a prime (20113131031127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45501790 + ... + 45941692.

It is an arithmetic number, because the mean of its divisors is an integer number (1382593637376).

Almost surely, 2^{20113131031123} is an apocalyptic number.

20113131031123 is a deficient number, since it is larger than the sum of its proper divisors (2008367166893).

20113131031123 is a wasteful number, since it uses less digits than its factorization.

20113131031123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514794.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 20113131031123 its reverse (32113013131102), we get a palindrome (52226144162225).

The spelling of 20113131031123 in words is "twenty trillion, one hundred thirteen billion, one hundred thirty-one million, thirty-one thousand, one hundred twenty-three".