305630220 has 48 divisors (see below), whose sum is σ = 978018048. Its totient is φ = 69858240.

The previous prime is 305630179. The next prime is 305630239. The reversal of 305630220 is 22036503.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363426 + ... + 364265.

It is an arithmetic number, because the mean of its divisors is an integer number (20375376).

Almost surely, 2^305630220 is an apocalyptic number.

305630220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

305630220 is an abundant number, since it is smaller than the sum of its proper divisors (672387828).

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

305630220 is a wasteful number, since it uses less digits than its factorization.

305630220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727710 (or 727708 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 305630220 is about 17482.2830316867. The cubic root of 305630220 is about 673.5948602311.

Adding to 305630220 its reverse (22036503), we get a palindrome (327666723).

The spelling of 305630220 in words is "three hundred five million, six hundred thirty thousand, two hundred twenty".