204500400205 has 4 divisors (see below), whose sum is σ = 245400480252. Its totient is φ = 163600320160.

The previous prime is 204500400179. The next prime is 204500400211. The reversal of 204500400205 is 502004005402.

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 46679330916 + 157821069289 = 216054^2 + 397267^2 .

It is not a de Polignac number, because 204500400205 - 2⁷ = 204500400077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20450040016 + ... + 20450040025.

It is an arithmetic number, because the mean of its divisors is an integer number (61350120063).

Almost surely, 2^204500400205 is an apocalyptic number.

It is an amenable number.

204500400205 is a deficient number, since it is larger than the sum of its proper divisors (40900080047).

204500400205 is an equidigital number, since it uses as much as digits as its factorization.

204500400205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40900080046.

The product of its (nonzero) digits is 1600, while the sum is 22.

Adding to 204500400205 its reverse (502004005402), we get a palindrome (706504405607).

The spelling of 204500400205 in words is "two hundred four billion, five hundred million, four hundred thousand, two hundred five".