205404085 has 8 divisors (see below), whose sum is σ = 248426496. Its totient is φ = 163028880.

The previous prime is 205404037. The next prime is 205404103. The reversal of 205404085 is 580404502.

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

It is not a de Polignac number, because 205404085 - 2¹¹ = 205402037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161101 + ... + 162370.

It is an arithmetic number, because the mean of its divisors is an integer number (31053312).

Almost surely, 2^205404085 is an apocalyptic number.

It is an amenable number.

205404085 is a deficient number, since it is larger than the sum of its proper divisors (43022411).

205404085 is a wasteful number, since it uses less digits than its factorization.

205404085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323603.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 205404085 is about 14331.9253765850. The cubic root of 205404085 is about 590.0240198973.

Adding to 205404085 its reverse (580404502), we get a palindrome (785808587).

The spelling of 205404085 in words is "two hundred five million, four hundred four thousand, eighty-five".