204003 has 12 divisors (see below), whose sum is σ = 310440. Its totient is φ = 128736.

The previous prime is 203999. The next prime is 204007. The reversal of 204003 is 300402.

204003 is nontrivially palindromic in base 2 and base 13.

It is an interprime number because it is at equal distance from previous prime (203999) and next prime (204007).

It is not a de Polignac number, because 204003 - 2² = 203999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (204007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 426 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (25870).

2²⁰⁴⁰⁰³ is an apocalyptic number.

204003 is a deficient number, since it is larger than the sum of its proper divisors (106437).

204003 is a wasteful number, since it uses less digits than its factorization.

204003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 204003 is about 451.6669126691. Note that the first 3 decimals coincide. The cubic root of 204003 is about 58.8679417343.

Adding to 204003 its reverse (300402), we get a palindrome (504405).

The spelling of 204003 in words is "two hundred four thousand, three", and thus it is an iban number.