204545 has 8 divisors (see below), whose sum is σ = 267840. Its totient is φ = 148720.

The previous prime is 204521. The next prime is 204557. The reversal of 204545 is 545402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204545 - 2⁶ = 204481 is a prime.

204545 is a modest number, since divided by 4545 gives 20 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1805 + ... + 1914.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2²⁰⁴⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

204545 is a deficient number, since it is larger than the sum of its proper divisors (63295).

204545 is a wasteful number, since it uses less digits than its factorization.

204545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 204545 is about 452.2665143475. The cubic root of 204545 is about 58.9200295459.

Adding to 204545 its reverse (545402), we get a palindrome (749947).

The spelling of 204545 in words is "two hundred four thousand, five hundred forty-five".