20013131005 has 24 divisors (see below), whose sum is σ = 28010538720. Its totient is φ = 13687017120.

The previous prime is 20013130987. The next prime is 20013131009. The reversal of 20013131005 is 50013131002.

It is not a de Polignac number, because 20013131005 - 2¹¹ = 20013128957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20013131005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013131009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14911 + ... + 200620.

It is an arithmetic number, because the mean of its divisors is an integer number (1167105780).

Almost surely, 2^20013131005 is an apocalyptic number.

It is an amenable number.

20013131005 is a deficient number, since it is larger than the sum of its proper divisors (7997407715).

20013131005 is a wasteful number, since it uses less digits than its factorization.

20013131005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215929 (or 215922 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

Adding to 20013131005 its reverse (50013131002), we get a palindrome (70026262007).

The spelling of 20013131005 in words is "twenty billion, thirteen million, one hundred thirty-one thousand, five".