205404 has 12 divisors (see below), whose sum is σ = 479304. Its totient is φ = 68464.

The previous prime is 205399. The next prime is 205417. The reversal of 205404 is 404502.

205404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8547 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (39942).

2²⁰⁵⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

205404 is an abundant number, since it is smaller than the sum of its proper divisors (273900).

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

205404 is a wasteful number, since it uses less digits than its factorization.

205404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124 (or 17122 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 205404 is about 453.2151806813. The cubic root of 205404 is about 59.0023938510.

Adding to 205404 its reverse (404502), we get a palindrome (609906).

The spelling of 205404 in words is "two hundred five thousand, four hundred four".