205130686 has 4 divisors (see below), whose sum is σ = 307696032. Its totient is φ = 102565342.

The previous prime is 205130647. The next prime is 205130693. The reversal of 205130686 is 686031502.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51282670 + ... + 51282673.

It is an arithmetic number, because the mean of its divisors is an integer number (76924008).

Almost surely, 2^205130686 is an apocalyptic number.

205130686 is a deficient number, since it is larger than the sum of its proper divisors (102565346).

205130686 is a wasteful number, since it uses less digits than its factorization.

205130686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102565345.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 205130686 is about 14322.3840892499. The cubic root of 205130686 is about 589.7621237746.

The spelling of 205130686 in words is "two hundred five million, one hundred thirty thousand, six hundred eighty-six".