30855220 has 48 divisors (see below), whose sum is σ = 71265600. Its totient is φ = 11128320.

The previous prime is 30855211. The next prime is 30855229. The reversal of 30855220 is 2255803.

It is an interprime number because it is at equal distance from previous prime (30855211) and next prime (30855229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30855229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30076 + ... + 31084.

It is an arithmetic number, because the mean of its divisors is an integer number (1484700).

Almost surely, 2^30855220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30855220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35632800).

30855220 is an abundant number, since it is smaller than the sum of its proper divisors (40410380).

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

30855220 is a wasteful number, since it uses less digits than its factorization.

30855220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 30855220 is about 5554.7475190147. The cubic root of 30855220 is about 313.6482598964.

The spelling of 30855220 in words is "thirty million, eight hundred fifty-five thousand, two hundred twenty".