204509604 has 72 divisors (see below), whose sum is σ = 533551872. Its totient is φ = 60877440.

The previous prime is 204509603. The next prime is 204509651. The reversal of 204509604 is 406905402.

It is not an unprimeable number, because it can be changed into a prime (204509603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61242 + ... + 64494.

Almost surely, 2^204509604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204509604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266775936).

204509604 is an abundant number, since it is smaller than the sum of its proper divisors (329042268).

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

204509604 is a wasteful number, since it uses less digits than its factorization.

204509604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317 (or 3302 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 204509604 is about 14300.6854381180. The cubic root of 204509604 is about 589.1663069534.

The spelling of 204509604 in words is "two hundred four million, five hundred nine thousand, six hundred four".