30920990 has 16 divisors (see below), whose sum is σ = 55952640. Its totient is φ = 12302880.

The previous prime is 30920987. The next prime is 30921013. The reversal of 30920990 is 9902903.

It is a super-2 number, since 2×30920990² = 1912215245160200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6185 + ... + 10004.

It is an arithmetic number, because the mean of its divisors is an integer number (3497040).

Almost surely, 2^30920990 is an apocalyptic number.

30920990 is a deficient number, since it is larger than the sum of its proper divisors (25031650).

30920990 is a wasteful number, since it uses less digits than its factorization.

30920990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16387.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 30920990 is about 5560.6645286332. The cubic root of 30920990 is about 313.8709559401.

The spelling of 30920990 in words is "thirty million, nine hundred twenty thousand, nine hundred ninety".