31325336820 has 96 divisors (see below), whose sum is σ = 97485978240. Its totient is φ = 8350905600.

The previous prime is 31325336767. The next prime is 31325336821. The reversal of 31325336820 is 2863352313.

31325336820 is a `hidden beast` number, since 31 + 32 + 533 + 68 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325336821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2397024 + ... + 2410056.

It is an arithmetic number, because the mean of its divisors is an integer number (1015478940).

Almost surely, 2^31325336820 is an apocalyptic number.

31325336820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31325336820 is an abundant number, since it is smaller than the sum of its proper divisors (66160641420).

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

31325336820 is a wasteful number, since it uses less digits than its factorization.

31325336820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17502 (or 17494 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 31325336820 in words is "thirty-one billion, three hundred twenty-five million, three hundred thirty-six thousand, eight hundred twenty".