31996020 has 72 divisors (see below), whose sum is σ = 104225184. Its totient is φ = 7312704.

The previous prime is 31995983. The next prime is 31996021. The reversal of 31996020 is 2069913.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31996021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2502 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (1447572).

Almost surely, 2^31996020 is an apocalyptic number.

31996020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31996020 is an abundant number, since it is smaller than the sum of its proper divisors (72229164).

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

31996020 is a wasteful number, since it uses less digits than its factorization.

31996020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909 (or 10900 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 31996020 is about 5656.5024529297. The cubic root of 31996020 is about 317.4670476475.

The spelling of 31996020 in words is "thirty-one million, nine hundred ninety-six thousand, twenty".