204398660 has 12 divisors (see below), whose sum is σ = 429237228. Its totient is φ = 81759456.

The previous prime is 204398639. The next prime is 204398669. The reversal of 204398660 is 66893402.

It can be written as a sum of positive squares in 2 ways, for example, as 117983044 + 86415616 = 10862^2 + 9296^2 .

It is not an unprimeable number, because it can be changed into a prime (204398669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5109947 + ... + 5109986.

It is an arithmetic number, because the mean of its divisors is an integer number (35769769).

Almost surely, 2^204398660 is an apocalyptic number.

204398660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204398660 is an abundant number, since it is smaller than the sum of its proper divisors (224838568).

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

204398660 is a wasteful number, since it uses less digits than its factorization.

204398660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219942 (or 10219940 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 204398660 is about 14296.8059369917. The cubic root of 204398660 is about 589.0597491376.

The spelling of 204398660 in words is "two hundred four million, three hundred ninety-eight thousand, six hundred sixty".