205104505 has 16 divisors (see below), whose sum is σ = 255638160. Its totient is φ = 157842432.

The previous prime is 205104503. The next prime is 205104521. The reversal of 205104505 is 505401502.

It can be written as a sum of positive squares in 8 ways, for example, as 5645376 + 199459129 = 2376^2 + 14123^2 .

It is a cyclic number.

It is not a de Polignac number, because 205104505 - 2¹ = 205104503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205104503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10237 + ... + 22693.

It is an arithmetic number, because the mean of its divisors is an integer number (15977385).

Almost surely, 2^205104505 is an apocalyptic number.

It is an amenable number.

205104505 is a deficient number, since it is larger than the sum of its proper divisors (50533655).

205104505 is a wasteful number, since it uses less digits than its factorization.

205104505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12588.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 205104505 is about 14321.4700711903. The cubic root of 205104505 is about 589.7370320970.

The spelling of 205104505 in words is "two hundred five million, one hundred four thousand, five hundred five".