31613020 has 12 divisors (see below), whose sum is σ = 66387384. Its totient is φ = 12645200.

The previous prime is 31612991. The next prime is 31613027. The reversal of 31613020 is 2031613.

It is a junction number, because it is equal to n+sod(n) for n = 31612985 and 31613003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31613027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790306 + ... + 790345.

It is an arithmetic number, because the mean of its divisors is an integer number (5532282).

Almost surely, 2^31613020 is an apocalyptic number.

It is an amenable number.

31613020 is an abundant number, since it is smaller than the sum of its proper divisors (34774364).

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

31613020 is a wasteful number, since it uses less digits than its factorization.

31613020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580660 (or 1580658 counting only the distinct ones).

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

The square root of 31613020 is about 5622.5456867864. The cubic root of 31613020 is about 316.1952406660.

Adding to 31613020 its reverse (2031613), we get a palindrome (33644633).

The spelling of 31613020 in words is "thirty-one million, six hundred thirteen thousand, twenty".