31132013020 has 48 divisors (see below), whose sum is σ = 66156638688. Its totient is φ = 12305018880.

The previous prime is 31132012991. The next prime is 31132013021. The reversal of 31132013020 is 2031023113.

It is a junction number, because it is equal to n+sod(n) for n = 31132012985 and 31132013003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132013021) 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, 727252 + ... + 768868.

It is an arithmetic number, because the mean of its divisors is an integer number (1378263306).

Almost surely, 2^31132013020 is an apocalyptic number.

It is an amenable number.

31132013020 is an abundant number, since it is smaller than the sum of its proper divisors (35024625668).

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

31132013020 is a wasteful number, since it uses less digits than its factorization.

31132013020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42070 (or 42068 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31132013020 its reverse (2031023113), we get a palindrome (33163036133).

The spelling of 31132013020 in words is "thirty-one billion, one hundred thirty-two million, thirteen thousand, twenty".