204021800 has 24 divisors (see below), whose sum is σ = 474351150. Its totient is φ = 81608640.

The previous prime is 204021761. The next prime is 204021803. The reversal of 204021800 is 8120402.

It can be written as a sum of positive squares in 3 ways, for example, as 199769956 + 4251844 = 14134^2 + 2062^2 .

It is not an unprimeable number, because it can be changed into a prime (204021803) 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, 509855 + ... + 510254.

Almost surely, 2^204021800 is an apocalyptic number.

204021800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204021800 is an abundant number, since it is smaller than the sum of its proper divisors (270329350).

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

204021800 is a wasteful number, since it uses less digits than its factorization.

204021800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020125 (or 1020116 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 204021800 is about 14283.6199893444. The cubic root of 204021800 is about 588.6975001382.

It can be divided in two parts, 20402 and 1800, that multiplied together give a square (36723600 = 6060²).

The spelling of 204021800 in words is "two hundred four million, twenty-one thousand, eight hundred".