204815220 has 24 divisors (see below), whose sum is σ = 573482784. Its totient is φ = 54617376.

The previous prime is 204815183. The next prime is 204815257. The reversal of 204815220 is 22518402.

It is an interprime number because it is at equal distance from previous prime (204815183) and next prime (204815257).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1706734 + ... + 1706853.

It is an arithmetic number, because the mean of its divisors is an integer number (23895116).

Almost surely, 2^204815220 is an apocalyptic number.

204815220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204815220 is an abundant number, since it is smaller than the sum of its proper divisors (368667564).

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

204815220 is a wasteful number, since it uses less digits than its factorization.

204815220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413599 (or 3413597 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 204815220 is about 14311.3668110352. The cubic root of 204815220 is about 589.4596412331.

The spelling of 204815220 in words is "two hundred four million, eight hundred fifteen thousand, two hundred twenty".