30820218 has 64 divisors (see below), whose sum is σ = 76712832. Its totient is φ = 8110080.

The previous prime is 30820217. The next prime is 30820241. The reversal of 30820218 is 81202803.

It is not an unprimeable number, because it can be changed into a prime (30820217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13530 + ... + 15642.

It is an arithmetic number, because the mean of its divisors is an integer number (1198638).

Almost surely, 2^30820218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30820218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38356416).

30820218 is an abundant number, since it is smaller than the sum of its proper divisors (45892614).

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

30820218 is a wasteful number, since it uses less digits than its factorization.

30820218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 30820218 is about 5551.5959867411. The cubic root of 30820218 is about 313.5296147071.

The spelling of 30820218 in words is "thirty million, eight hundred twenty thousand, two hundred eighteen".