205868205 has 12 divisors (see below), whose sum is σ = 356838300. Its totient is φ = 109796352.

The previous prime is 205868197. The next prime is 205868207. The reversal of 205868205 is 502868502.

It can be written as a sum of positive squares in 2 ways, for example, as 43917129 + 161951076 = 6627^2 + 12726^2 .

It is not a de Polignac number, because 205868205 - 2³ = 205868197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205868205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205868207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2287380 + ... + 2287469.

It is an arithmetic number, because the mean of its divisors is an integer number (29736525).

Almost surely, 2^205868205 is an apocalyptic number.

It is an amenable number.

205868205 is a deficient number, since it is larger than the sum of its proper divisors (150970095).

205868205 is a wasteful number, since it uses less digits than its factorization.

205868205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574860 (or 4574857 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 205868205 is about 14348.1080634347. The cubic root of 205868205 is about 590.4680810980.

The spelling of 205868205 in words is "two hundred five million, eight hundred sixty-eight thousand, two hundred five".