204543 has 6 divisors (see below), whose sum is σ = 295464. Its totient is φ = 136356.

The previous prime is 204521. The next prime is 204557. The reversal of 204543 is 345402.

It is a happy number.

It is not a de Polignac number, because 204543 - 2⁵ = 204511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11355 + ... + 11372.

It is an arithmetic number, because the mean of its divisors is an integer number (49244).

2²⁰⁴⁵⁴³ is an apocalyptic number.

204543 is a deficient number, since it is larger than the sum of its proper divisors (90921).

204543 is a wasteful number, since it uses less digits than its factorization.

204543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22733 (or 22730 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 204543 is about 452.2643032564. The cubic root of 204543 is about 58.9198375092.

Adding to 204543 its reverse (345402), we get a palindrome (549945).

It can be divided in two parts, 204 and 543, that added together give a palindrome (747).

The spelling of 204543 in words is "two hundred four thousand, five hundred forty-three".