204065 has 4 divisors (see below), whose sum is σ = 244884. Its totient is φ = 163248.

The previous prime is 204059. The next prime is 204067. The reversal of 204065 is 560402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 160801 + 43264 = 401^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 204065 - 2⁸ = 203809 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 204065.

It is not an unprimeable number, because it can be changed into a prime (204067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20402 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (61221).

2²⁰⁴⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

204065 is a deficient number, since it is larger than the sum of its proper divisors (40819).

204065 is an equidigital number, since it uses as much as digits as its factorization.

204065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40818.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 204065 is about 451.7355421040. The cubic root of 204065 is about 58.8739047883.

Adding to 204065 its reverse (560402), we get a palindrome (764467).

The spelling of 204065 in words is "two hundred four thousand, sixty-five".