31313123020 has 48 divisors (see below), whose sum is σ = 67181063040. Its totient is φ = 12254299904.

The previous prime is 31313122943. The next prime is 31313123029. The reversal of 31313123020 is 2032131313.

It is not an unprimeable number, because it can be changed into a prime (31313123029) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3971322 + ... + 3979198.

It is an arithmetic number, because the mean of its divisors is an integer number (1399605480).

Almost surely, 2^31313123020 is an apocalyptic number.

It is an amenable number.

31313123020 is an abundant number, since it is smaller than the sum of its proper divisors (35867940020).

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

31313123020 is a wasteful number, since it uses less digits than its factorization.

31313123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12162 (or 12160 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31313123020 its reverse (2032131313), we get a palindrome (33345254333).

The spelling of 31313123020 in words is "thirty-one billion, three hundred thirteen million, one hundred twenty-three thousand, twenty".