204105 has 16 divisors (see below), whose sum is σ = 356544. Its totient is φ = 98880.

The previous prime is 204101. The next prime is 204107. The reversal of 204105 is 501402.

204105 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 204105 - 2² = 204101 is a prime.

It is a Curzon number.

204105 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (204101) 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, 454 + ... + 783.

It is an arithmetic number, because the mean of its divisors is an integer number (22284).

2²⁰⁴¹⁰⁵ is an apocalyptic number.

It is an amenable number.

204105 is a deficient number, since it is larger than the sum of its proper divisors (152439).

204105 is a wasteful number, since it uses less digits than its factorization.

204105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 204105 is about 451.7798136261. The cubic root of 204105 is about 58.8777512790.

Adding to 204105 its reverse (501402), we get a palindrome (705507).

The spelling of 204105 in words is "two hundred four thousand, one hundred five".