30980920 has 16 divisors (see below), whose sum is σ = 69707160. Its totient is φ = 12392352.

The previous prime is 30980899. The next prime is 30980923. The reversal of 30980920 is 2908903.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30980923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387222 + ... + 387301.

Almost surely, 2^30980920 is an apocalyptic number.

It is an amenable number.

30980920 is an abundant number, since it is smaller than the sum of its proper divisors (38726240).

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

30980920 is a wasteful number, since it uses less digits than its factorization.

30980920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774534 (or 774530 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 30980920 is about 5566.0506645197. The cubic root of 30980920 is about 314.0736030414.

The spelling of 30980920 in words is "thirty million, nine hundred eighty thousand, nine hundred twenty".