205120866 has 16 divisors (see below), whose sum is σ = 410572224. Its totient is φ = 68318544.

The previous prime is 205120813. The next prime is 205120871. The reversal of 205120866 is 668021502.

205120866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5301 + ... + 20936.

It is an arithmetic number, because the mean of its divisors is an integer number (25660764).

Almost surely, 2^205120866 is an apocalyptic number.

205120866 is an abundant number, since it is smaller than the sum of its proper divisors (205451358).

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

205120866 is a wasteful number, since it uses less digits than its factorization.

205120866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27545.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 205120866 is about 14322.0412651270. The cubic root of 205120866 is about 589.7527126092.

The spelling of 205120866 in words is "two hundred five million, one hundred twenty thousand, eight hundred sixty-six".