30307220 has 18 divisors (see below), whose sum is σ = 63696906. Its totient is φ = 12113040.

The previous prime is 30307213. The next prime is 30307229. The reversal of 30307220 is 2270303.

It can be written as a sum of positive squares in only one way, i.e., 24245776 + 6061444 = 4924^2 + 2462^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30307229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24005 + ... + 25235.

It is an arithmetic number, because the mean of its divisors is an integer number (3538717).

Almost surely, 2^30307220 is an apocalyptic number.

It is an amenable number.

30307220 is an abundant number, since it is smaller than the sum of its proper divisors (33389686).

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

30307220 is an equidigital number, since it uses as much as digits as its factorization.

30307220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 30307220 is about 5505.1993606045. The cubic root of 30307220 is about 311.7803214733.

Adding to 30307220 its reverse (2270303), we get a palindrome (32577523).

The spelling of 30307220 in words is "thirty million, three hundred seven thousand, two hundred twenty".