204421904 has 20 divisors (see below), whose sum is σ = 397140876. Its totient is φ = 101933952.

The previous prime is 204421897. The next prime is 204421909. The reversal of 204421904 is 409124402.

It can be written as a sum of positive squares in 2 ways, for example, as 73273600 + 131148304 = 8560^2 + 11452^2 .

It is not an unprimeable number, because it can be changed into a prime (204421909) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11159 + ... + 23094.

Almost surely, 2^204421904 is an apocalyptic number.

It is an amenable number.

204421904 is a deficient number, since it is larger than the sum of its proper divisors (192718972).

204421904 is a wasteful number, since it uses less digits than its factorization.

204421904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34634 (or 34628 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 204421904 is about 14297.6188227271. The cubic root of 204421904 is about 589.0820773756.

The spelling of 204421904 in words is "two hundred four million, four hundred twenty-one thousand, nine hundred four".