31310313020 has 72 divisors (see below), whose sum is σ = 77740649280. Its totient is φ = 10558961280.

The previous prime is 31310312987. The next prime is 31310313061. The reversal of 31310313020 is 2031301313.

It is a self number, because there is not a number n which added to its sum of digits gives 31310313020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202100 + ... + 321659.

It is an arithmetic number, because the mean of its divisors is an integer number (1079731240).

Almost surely, 2^31310313020 is an apocalyptic number.

It is an amenable number.

31310313020 is an abundant number, since it is smaller than the sum of its proper divisors (46430336260).

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

31310313020 is a wasteful number, since it uses less digits than its factorization.

31310313020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523843 (or 523834 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31310313020 its reverse (2031301313), we get a palindrome (33341614333).

The spelling of 31310313020 in words is "thirty-one billion, three hundred ten million, three hundred thirteen thousand, twenty".