205711868 has 24 divisors (see below), whose sum is σ = 369100368. Its totient is φ = 100279296.

The previous prime is 205711861. The next prime is 205711873. The reversal of 205711868 is 868117502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205711861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31580 + ... + 37532.

It is an arithmetic number, because the mean of its divisors is an integer number (15379182).

Almost surely, 2^205711868 is an apocalyptic number.

It is an amenable number.

205711868 is a deficient number, since it is larger than the sum of its proper divisors (163388500).

205711868 is a wasteful number, since it uses less digits than its factorization.

205711868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6173 (or 6171 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 205711868 is about 14342.6590282276. The cubic root of 205711868 is about 590.3185754379.

The spelling of 205711868 in words is "two hundred five million, seven hundred eleven thousand, eight hundred sixty-eight".