31950220 has 24 divisors (see below), whose sum is σ = 70013664. Its totient is φ = 12224256.

The previous prime is 31950209. The next prime is 31950227. The reversal of 31950220 is 2205913.

It is a junction number, because it is equal to n+sod(n) for n = 31950191 and 31950200.

It is not an unprimeable number, because it can be changed into a prime (31950227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 34269 + ... + 35188.

It is an arithmetic number, because the mean of its divisors is an integer number (2917236).

Almost surely, 2^31950220 is an apocalyptic number.

It is an amenable number.

31950220 is an abundant number, since it is smaller than the sum of its proper divisors (38063444).

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

31950220 is a wasteful number, since it uses less digits than its factorization.

31950220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69489 (or 69487 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 31950220 is about 5652.4525650376. The cubic root of 31950220 is about 317.3154982365.

The spelling of 31950220 in words is "thirty-one million, nine hundred fifty thousand, two hundred twenty".