20431312131 has 8 divisors (see below), whose sum is σ = 27297689344. Its totient is φ = 13592904840.

The previous prime is 20431312117. The next prime is 20431312141. The reversal of 20431312131 is 13121313402.

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

It is not a de Polignac number, because 20431312131 - 2¹⁰ = 20431311107 is a prime.

It is a super-2 number, since 2×20431312131² (a number of 21 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 = 20431312098 and 20431312107.

It is not an unprimeable number, because it can be changed into a prime (20431312141) 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, 6990775 + ... + 6993696.

It is an arithmetic number, because the mean of its divisors is an integer number (3412211168).

Almost surely, 2^20431312131 is an apocalyptic number.

20431312131 is a deficient number, since it is larger than the sum of its proper divisors (6866377213).

20431312131 is a wasteful number, since it uses less digits than its factorization.

20431312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13984961.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20431312131 its reverse (13121313402), we get a palindrome (33552625533).

The spelling of 20431312131 in words is "twenty billion, four hundred thirty-one million, three hundred twelve thousand, one hundred thirty-one".