204553 has 4 divisors (see below), whose sum is σ = 208080. Its totient is φ = 201028.

The previous prime is 204521. The next prime is 204557. The reversal of 204553 is 355402.

It is a happy number.

204553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204553 - 2⁵ = 204521 is a prime.

It is a Duffinian number.

204553 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 204553.

It is not an unprimeable number, because it can be changed into a prime (204557) 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, 1675 + ... + 1792.

It is an arithmetic number, because the mean of its divisors is an integer number (52020).

2²⁰⁴⁵⁵³ is an apocalyptic number.

It is an amenable number.

204553 is a deficient number, since it is larger than the sum of its proper divisors (3527).

204553 is an equidigital number, since it uses as much as digits as its factorization.

204553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 204553 is about 452.2753586036. The cubic root of 204553 is about 58.9207976802.

Adding to 204553 its reverse (355402), we get a palindrome (559955).

It can be divided in two parts, 204 and 553, that added together give a palindrome (757).

The spelling of 204553 in words is "two hundred four thousand, five hundred fifty-three".