304520220 has 72 divisors (see below), whose sum is σ = 972338640. Its totient is φ = 76930560.

The previous prime is 304520189. The next prime is 304520231. The reversal of 304520220 is 22025403.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 304520193 and 304520202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41101 + ... + 47940.

Almost surely, 2^304520220 is an apocalyptic number.

304520220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

304520220 is an abundant number, since it is smaller than the sum of its proper divisors (667818420).

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

304520220 is a wasteful number, since it uses less digits than its factorization.

304520220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89075 (or 89070 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 304520220 is about 17450.5077290032. The cubic root of 304520220 is about 672.7784081479.

Adding to 304520220 its reverse (22025403), we get a palindrome (326545623).

The spelling of 304520220 in words is "three hundred four million, five hundred twenty thousand, two hundred twenty".