205089705 has 64 divisors (see below), whose sum is σ = 394348800. Its totient is φ = 100776960.

The previous prime is 205089673. The next prime is 205089721. The reversal of 205089705 is 507980502.

It is not a de Polignac number, because 205089705 - 2⁵ = 205089673 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205089705.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 93825 + ... + 95985.

It is an arithmetic number, because the mean of its divisors is an integer number (6161700).

Almost surely, 2^205089705 is an apocalyptic number.

It is an amenable number.

205089705 is a deficient number, since it is larger than the sum of its proper divisors (189259095).

205089705 is a wasteful number, since it uses less digits than its factorization.

205089705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2225 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 205089705 is about 14320.9533551367. The cubic root of 205089705 is about 589.7228469413.

The spelling of 205089705 in words is "two hundred five million, eighty-nine thousand, seven hundred five".