204420553 has 4 divisors (see below), whose sum is σ = 204449668. Its totient is φ = 204391440.

The previous prime is 204420521. The next prime is 204420569. The reversal of 204420553 is 355024402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 355024402 = 2 ⋅177512201.

It can be written as a sum of positive squares in 2 ways, for example, as 16949689 + 187470864 = 4117^2 + 13692^2 .

It is a cyclic number.

It is not a de Polignac number, because 204420553 - 2⁵ = 204420521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204420583) 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, 3175 + ... + 20467.

It is an arithmetic number, because the mean of its divisors is an integer number (51112417).

Almost surely, 2^204420553 is an apocalyptic number.

It is an amenable number.

204420553 is a deficient number, since it is larger than the sum of its proper divisors (29115).

204420553 is a wasteful number, since it uses less digits than its factorization.

204420553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29114.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 204420553 is about 14297.5715770196. The cubic root of 204420553 is about 589.0807796484.

Adding to 204420553 its reverse (355024402), we get a palindrome (559444955).

The spelling of 204420553 in words is "two hundred four million, four hundred twenty thousand, five hundred fifty-three".