204243005 has 4 divisors (see below), whose sum is σ = 245091612. Its totient is φ = 163394400.

The previous prime is 204242999. The next prime is 204243007. The reversal of 204243005 is 500342402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137428729 + 66814276 = 11723^2 + 8174^2 .

It is not a de Polignac number, because 204243005 - 2¹⁴ = 204226621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20424296 + ... + 20424305.

It is an arithmetic number, because the mean of its divisors is an integer number (61272903).

Almost surely, 2^204243005 is an apocalyptic number.

It is an amenable number.

204243005 is a deficient number, since it is larger than the sum of its proper divisors (40848607).

204243005 is an equidigital number, since it uses as much as digits as its factorization.

204243005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40848606.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 204243005 is about 14291.3612017890. The cubic root of 204243005 is about 588.9101829582.

Adding to 204243005 its reverse (500342402), we get a palindrome (704585407).

The spelling of 204243005 in words is "two hundred four million, two hundred forty-three thousand, five".