31220930 has 32 divisors (see below), whose sum is σ = 60997104. Its totient is φ = 11437056.

The previous prime is 31220927. The next prime is 31220941. The reversal of 31220930 is 3902213.

It can be written as a sum of positive squares in 8 ways, for example, as 1985281 + 29235649 = 1409^2 + 5407^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16934 + ... + 18686.

Almost surely, 2^31220930 is an apocalyptic number.

31220930 is a deficient number, since it is larger than the sum of its proper divisors (29776174).

31220930 is a wasteful number, since it uses less digits than its factorization.

31220930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 31220930 is about 5587.5692389446. The cubic root of 31220930 is about 314.8825630930.

The spelling of 31220930 in words is "thirty-one million, two hundred twenty thousand, nine hundred thirty".