30920931 has 12 divisors (see below), whose sum is σ = 46204080. Its totient is φ = 19902960.

The previous prime is 30920921. The next prime is 30920951. The reversal of 30920931 is 13902903.

It is not a de Polignac number, because 30920931 - 2⁵ = 30920899 is a prime.

It is a super-2 number, since 2×30920931² = 1912207947813522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30920895 and 30920904.

It is not an unprimeable number, because it can be changed into a prime (30920921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58975 + ... + 59496.

It is an arithmetic number, because the mean of its divisors is an integer number (3850340).

Almost surely, 2^30920931 is an apocalyptic number.

30920931 is a deficient number, since it is larger than the sum of its proper divisors (15283149).

30920931 is a wasteful number, since it uses less digits than its factorization.

30920931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118506 (or 118503 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 30920931 is about 5560.6592235094. The cubic root of 30920931 is about 313.8707563088.

The spelling of 30920931 in words is "thirty million, nine hundred twenty thousand, nine hundred thirty-one".