31920242 has 16 divisors (see below), whose sum is σ = 50031000. Its totient is φ = 15254400.

The previous prime is 31920241. The next prime is 31920253. The reversal of 31920242 is 24202913.

It can be written as a sum of positive squares in 4 ways, for example, as 28826161 + 3094081 = 5369^2 + 1759^2 .

It is not an unprimeable number, because it can be changed into a prime (31920241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3134 + ... + 8582.

Almost surely, 2^31920242 is an apocalyptic number.

31920242 is a deficient number, since it is larger than the sum of its proper divisors (18110758).

31920242 is a wasteful number, since it uses less digits than its factorization.

31920242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31920242 is about 5649.8001734575. The cubic root of 31920242 is about 317.2162244219.

The spelling of 31920242 in words is "thirty-one million, nine hundred twenty thousand, two hundred forty-two".