30956220 has 72 divisors (see below), whose sum is σ = 94436160. Its totient is φ = 8208000.

The previous prime is 30956207. The next prime is 30956239. The reversal of 30956220 is 2265903.

30956220 is a `hidden beast` number, since 30 + 9 + 5 + 622 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40845 + ... + 41595.

Almost surely, 2^30956220 is an apocalyptic number.

30956220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30956220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47218080).

30956220 is an abundant number, since it is smaller than the sum of its proper divisors (63479940).

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

30956220 is a wasteful number, since it uses less digits than its factorization.

30956220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 30956220 is about 5563.8314136933. The cubic root of 30956220 is about 313.9901142303.

The spelling of 30956220 in words is "thirty million, nine hundred fifty-six thousand, two hundred twenty".