205939605 has 16 divisors (see below), whose sum is σ = 331718400. Its totient is φ = 109096128.

The previous prime is 205939589. The next prime is 205939619. The reversal of 205939605 is 506939502.

It is not a de Polignac number, because 205939605 - 2⁴ = 205939589 is a prime.

It is a super-2 number, since 2×205939605² = 84822241815112050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43837 + ... + 48306.

It is an arithmetic number, because the mean of its divisors is an integer number (20732400).

Almost surely, 2^205939605 is an apocalyptic number.

It is an amenable number.

205939605 is a deficient number, since it is larger than the sum of its proper divisors (125778795).

205939605 is a wasteful number, since it uses less digits than its factorization.

205939605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92300.

The product of its (nonzero) digits is 72900, while the sum is 39.

The square root of 205939605 is about 14350.5959806553. The cubic root of 205939605 is about 590.5363360089.

The spelling of 205939605 in words is "two hundred five million, nine hundred thirty-nine thousand, six hundred five".