31949920 has 24 divisors (see below), whose sum is σ = 75482064. Its totient is φ = 12779904.

The previous prime is 31949917. The next prime is 31949927. The reversal of 31949920 is 2994913.

It is a self number, because there is not a number n which added to its sum of digits gives 31949920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31949927) 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 3 ways as a sum of consecutive naturals, for example, 99684 + ... + 100003.

It is an arithmetic number, because the mean of its divisors is an integer number (3145086).

Almost surely, 2^31949920 is an apocalyptic number.

It is an amenable number.

31949920 is an abundant number, since it is smaller than the sum of its proper divisors (43532144).

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

31949920 is a wasteful number, since it uses less digits than its factorization.

31949920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199702 (or 199694 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 31949920 is about 5652.4260278220. The cubic root of 31949920 is about 317.3145050775.

The spelling of 31949920 in words is "thirty-one million, nine hundred forty-nine thousand, nine hundred twenty".