30117920 has 48 divisors (see below), whose sum is σ = 81321408. Its totient is φ = 10325760.

The previous prime is 30117917. The next prime is 30117937. The reversal of 30117920 is 2971103.

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, 12326 + ... + 14565.

It is an arithmetic number, because the mean of its divisors is an integer number (1694196).

Almost surely, 2^30117920 is an apocalyptic number.

It is an amenable number.

30117920 is an abundant number, since it is smaller than the sum of its proper divisors (51203488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30117920 is a wasteful number, since it uses less digits than its factorization.

30117920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26913 (or 26905 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 30117920 is about 5487.9795917988. The cubic root of 30117920 is about 311.1298348520.

The spelling of 30117920 in words is "thirty million, one hundred seventeen thousand, nine hundred twenty".