31920268 has 6 divisors (see below), whose sum is σ = 55860476. Its totient is φ = 15960132.

The previous prime is 31920253. The next prime is 31920269. The reversal of 31920268 is 86202913.

It is not an unprimeable number, because it can be changed into a prime (31920269) 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 as a sum of consecutive naturals, namely, 3990030 + ... + 3990037.

Almost surely, 2^31920268 is an apocalyptic number.

It is an amenable number.

31920268 is a deficient number, since it is larger than the sum of its proper divisors (23940208).

31920268 is a wasteful number, since it uses less digits than its factorization.

31920268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980071 (or 7980069 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 31920268 is about 5649.8024744233. The cubic root of 31920268 is about 317.2163105492.

The spelling of 31920268 in words is "thirty-one million, nine hundred twenty thousand, two hundred sixty-eight".