31612020 has 96 divisors (see below), whose sum is σ = 97445376. Its totient is φ = 7593600.

The previous prime is 31612013. The next prime is 31612043. The reversal of 31612020 is 2021613.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139147 + ... + 139373.

It is an arithmetic number, because the mean of its divisors is an integer number (1015056).

Almost surely, 2^31612020 is an apocalyptic number.

31612020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31612020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48722688).

31612020 is an abundant number, since it is smaller than the sum of its proper divisors (65833356).

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

31612020 is a wasteful number, since it uses less digits than its factorization.

31612020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31612020 is about 5622.4567583931. The cubic root of 31612020 is about 316.1919066117.

Adding to 31612020 its reverse (2021613), we get a palindrome (33633633).

The spelling of 31612020 in words is "thirty-one million, six hundred twelve thousand, twenty".