203604 has 36 divisors (see below), whose sum is σ = 512064. Its totient is φ = 62928.

The previous prime is 203591. The next prime is 203617. The reversal of 203604 is 406302.

203604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (203591) and next prime (203617).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4309 + ... + 4355.

It is an arithmetic number, because the mean of its divisors is an integer number (14224).

2²⁰³⁶⁰⁴ 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 203604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256032).

203604 is an abundant number, since it is smaller than the sum of its proper divisors (308460).

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

203604 is a wasteful number, since it uses less digits than its factorization.

203604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 203604 is about 451.2249993074. The cubic root of 203604 is about 58.8295376608.

Adding to 203604 its reverse (406302), we get a palindrome (609906).

The spelling of 203604 in words is "two hundred three thousand, six hundred four".