30845220 has 72 divisors (see below), whose sum is σ = 99070272. Its totient is φ = 7024320.

The previous prime is 30845219. The next prime is 30845251. The reversal of 30845220 is 2254803.

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, 113685 + ... + 113955.

It is an arithmetic number, because the mean of its divisors is an integer number (1375976).

Almost surely, 2^30845220 is an apocalyptic number.

30845220 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 30845220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49535136).

30845220 is an abundant number, since it is smaller than the sum of its proper divisors (68225052).

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

30845220 is a wasteful number, since it uses less digits than its factorization.

30845220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 30845220 is about 5553.8473151501. The cubic root of 30845220 is about 313.6143723673.

The spelling of 30845220 in words is "thirty million, eight hundred forty-five thousand, two hundred twenty".