30305220 has 192 divisors, whose sum is σ = 102041856. Its totient is φ = 6635520.

The previous prime is 30305201. The next prime is 30305243. The reversal of 30305220 is 2250303.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 30305220.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 415104 + ... + 415176.

It is an arithmetic number, because the mean of its divisors is an integer number (531468).

Almost surely, 2^30305220 is an apocalyptic number.

30305220 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 30305220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51020928).

30305220 is an abundant number, since it is smaller than the sum of its proper divisors (71736636).

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

30305220 is a wasteful number, since it uses less digits than its factorization.

30305220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 15.

The square root of 30305220 is about 5505.0177111432. The cubic root of 30305220 is about 311.7734631036.

Adding to 30305220 its reverse (2250303), we get a palindrome (32555523).

The spelling of 30305220 in words is "thirty million, three hundred five thousand, two hundred twenty".