204045 has 16 divisors (see below), whose sum is σ = 333312. Its totient is φ = 106560.

The previous prime is 204023. The next prime is 204047. The reversal of 204045 is 540402.

204045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204045 - 2⁵ = 204013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

204045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804 + ... + 1026.

It is an arithmetic number, because the mean of its divisors is an integer number (20832).

2²⁰⁴⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

204045 is a deficient number, since it is larger than the sum of its proper divisors (129267).

204045 is a wasteful number, since it uses less digits than its factorization.

204045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

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

The square root of 204045 is about 451.7134047159. The cubic root of 204045 is about 58.8719813545.

Adding to 204045 its reverse (540402), we get a palindrome (744447).

The spelling of 204045 in words is "two hundred four thousand, forty-five".