31313020 has 12 divisors (see below), whose sum is σ = 65757384. Its totient is φ = 12525200.

The previous prime is 31313017. The next prime is 31313039. The reversal of 31313020 is 2031313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782806 + ... + 782845.

It is an arithmetic number, because the mean of its divisors is an integer number (5479782).

Almost surely, 2^31313020 is an apocalyptic number.

It is an amenable number.

31313020 is an abundant number, since it is smaller than the sum of its proper divisors (34444364).

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

31313020 is a wasteful number, since it uses less digits than its factorization.

31313020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565660 (or 1565658 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31313020 is about 5595.8037849803. The cubic root of 31313020 is about 315.1918542348.

Adding to 31313020 its reverse (2031313), we get a palindrome (33344333).

The spelling of 31313020 in words is "thirty-one million, three hundred thirteen thousand, twenty".