20312131504 has 30 divisors (see below), whose sum is σ = 45780022644. Its totient is φ = 8705198880.

The previous prime is 20312131453. The next prime is 20312131523. The reversal of 20312131504 is 40513121302.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12953382 + ... + 12954949.

Almost surely, 2^20312131504 is an apocalyptic number.

It is an amenable number.

20312131504 is an abundant number, since it is smaller than the sum of its proper divisors (25467891140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20312131504 is a wasteful number, since it uses less digits than its factorization.

20312131504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25908353 (or 25908340 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20312131504 its reverse (40513121302), we get a palindrome (60825252806).

The spelling of 20312131504 in words is "twenty billion, three hundred twelve million, one hundred thirty-one thousand, five hundred four".