31916020 has 12 divisors (see below), whose sum is σ = 67023684. Its totient is φ = 12766400.

The previous prime is 31916011. The next prime is 31916033. The reversal of 31916020 is 2061913.

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 17338896 = 3818^2 + 4164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31915982 and 31916000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797881 + ... + 797920.

It is an arithmetic number, because the mean of its divisors is an integer number (5585307).

Almost surely, 2^31916020 is an apocalyptic number.

It is an amenable number.

31916020 is an abundant number, since it is smaller than the sum of its proper divisors (35107664).

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

31916020 is a wasteful number, since it uses less digits than its factorization.

31916020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595810 (or 1595808 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31916020 is about 5649.4265195682. The cubic root of 31916020 is about 317.2022380414.

Adding to 31916020 its reverse (2061913), we get a palindrome (33977933).

The spelling of 31916020 in words is "thirty-one million, nine hundred sixteen thousand, twenty".