204403 has 4 divisors (see below), whose sum is σ = 208800. Its totient is φ = 200008.

The previous prime is 204397. The next prime is 204427. The reversal of 204403 is 304402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204403 - 2⁵ = 204371 is a prime.

It is a Duffinian number.

204403 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (204443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128 + ... + 2221.

It is an arithmetic number, because the mean of its divisors is an integer number (52200).

2²⁰⁴⁴⁰³ is an apocalyptic number.

204403 is a deficient number, since it is larger than the sum of its proper divisors (4397).

204403 is an equidigital number, since it uses as much as digits as its factorization.

204403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 204403 is about 452.1095000108. The cubic root of 204403 is about 58.9063918280.

Adding to 204403 its reverse (304402), we get a palindrome (508805).

Subtracting 204403 from its reverse (304402), we obtain a palindrome (99999).

The spelling of 204403 in words is "two hundred four thousand, four hundred three", and thus it is an iban number.