205068636 has 18 divisors (see below), whose sum is σ = 518368032. Its totient is φ = 68356200.

The previous prime is 205068581. The next prime is 205068673. The reversal of 205068636 is 636860502.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5696351 = 205068636 / (2 + 0 + 5 + 0 + 6 + 8 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 205068636.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2848140 + ... + 2848211.

It is an arithmetic number, because the mean of its divisors is an integer number (28798224).

Almost surely, 2^205068636 is an apocalyptic number.

It is an amenable number.

205068636 is an abundant number, since it is smaller than the sum of its proper divisors (313299396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205068636 is a wasteful number, since it uses less digits than its factorization.

205068636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696361 (or 5696356 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 205068636 is about 14320.2177357748. The cubic root of 205068636 is about 589.7026520447.

The spelling of 205068636 in words is "two hundred five million, sixty-eight thousand, six hundred thirty-six".