31696920 has 112 divisors (see below), whose sum is σ = 107026560. Its totient is φ = 8444736.

The previous prime is 31696909. The next prime is 31696927. The reversal of 31696920 is 2969613.

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 (31696927) 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 27 ways as a sum of consecutive naturals, for example, 28617 + ... + 29703.

Almost surely, 2^31696920 is an apocalyptic number.

31696920 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 31696920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53513280).

31696920 is an abundant number, since it is smaller than the sum of its proper divisors (75329640).

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

31696920 is a wasteful number, since it uses less digits than its factorization.

31696920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 31696920 is about 5630.0017761987. The cubic root of 31696920 is about 316.4747177756.

The spelling of 31696920 in words is "thirty-one million, six hundred ninety-six thousand, nine hundred twenty".