204245105 has 4 divisors (see below), whose sum is σ = 245094132. Its totient is φ = 163396080.

The previous prime is 204245101. The next prime is 204245137. The reversal of 204245105 is 501542402.

It is a happy number.

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 78446449 + 125798656 = 8857^2 + 11216^2 .

It is not a de Polignac number, because 204245105 - 2² = 204245101 is a prime.

It is a super-2 number, since 2×204245105² = 83432125832922050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204245101) 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, 20424506 + ... + 20424515.

It is an arithmetic number, because the mean of its divisors is an integer number (61273533).

Almost surely, 2^204245105 is an apocalyptic number.

It is an amenable number.

204245105 is a deficient number, since it is larger than the sum of its proper divisors (40849027).

204245105 is an equidigital number, since it uses as much as digits as its factorization.

204245105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40849026.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 204245105 is about 14291.4346725582. The cubic root of 204245105 is about 588.9122013173.

Adding to 204245105 its reverse (501542402), we get a palindrome (705787507).

The spelling of 204245105 in words is "two hundred four million, two hundred forty-five thousand, one hundred five".