205095985 has 8 divisors (see below), whose sum is σ = 246346920. Its totient is φ = 163922304.

The previous prime is 205095959. The next prime is 205095997. The reversal of 205095985 is 589590502.

It can be written as a sum of positive squares in 4 ways, for example, as 23493409 + 181602576 = 4847^2 + 13476^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205095985 - 2²¹ = 202998833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13300 + ... + 24229.

It is an arithmetic number, because the mean of its divisors is an integer number (30793365).

Almost surely, 2^205095985 is an apocalyptic number.

It is an amenable number.

205095985 is a deficient number, since it is larger than the sum of its proper divisors (41250935).

205095985 is a wasteful number, since it uses less digits than its factorization.

205095985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38627.

The product of its (nonzero) digits is 162000, while the sum is 43.

The square root of 205095985 is about 14321.1726126040. The cubic root of 205095985 is about 589.7288661313.

The spelling of 205095985 in words is "two hundred five million, ninety-five thousand, nine hundred eighty-five".