204705 has 12 divisors (see below), whose sum is σ = 354900. Its totient is φ = 109152.

The previous prime is 204679. The next prime is 204707. The reversal of 204705 is 507402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 91809 = 336^2 + 303^2 .

It is not a de Polignac number, because 204705 - 2⁶ = 204641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2230 + ... + 2319.

It is an arithmetic number, because the mean of its divisors is an integer number (29575).

2²⁰⁴⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

204705 is a deficient number, since it is larger than the sum of its proper divisors (150195).

204705 is a wasteful number, since it uses less digits than its factorization.

204705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560 (or 4557 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 204705 is about 452.4433666217. The cubic root of 204705 is about 58.9353884282.

It can be divided in two parts, 204 and 705, that added together give a palindrome (909).

The spelling of 204705 in words is "two hundred four thousand, seven hundred five".