204004660 has 24 divisors (see below), whose sum is σ = 429105096. Its totient is φ = 81469440.

The previous prime is 204004639. The next prime is 204004741. The reversal of 204004660 is 66400402.

It can be written as a sum of positive squares in 4 ways, for example, as 89643024 + 114361636 = 9468^2 + 10694^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4864 + ... + 20776.

It is an arithmetic number, because the mean of its divisors is an integer number (17879379).

Almost surely, 2^204004660 is an apocalyptic number.

204004660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204004660 is an abundant number, since it is smaller than the sum of its proper divisors (225100436).

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

204004660 is a wasteful number, since it uses less digits than its factorization.

204004660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16563 (or 16561 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 204004660 is about 14283.0199887839. The cubic root of 204004660 is about 588.6810140605.

The spelling of 204004660 in words is "two hundred four million, four thousand, six hundred sixty".