206605605 has 16 divisors (see below), whose sum is σ = 331513920. Its totient is φ = 109874688.

The previous prime is 206605603. The next prime is 206605613. The reversal of 206605605 is 506506602.

It is not a de Polignac number, because 206605605 - 2¹ = 206605603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206605603) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14215 + ... + 24804.

It is an arithmetic number, because the mean of its divisors is an integer number (20719620).

Almost surely, 2^206605605 is an apocalyptic number.

It is an amenable number.

206605605 is a deficient number, since it is larger than the sum of its proper divisors (124908315).

206605605 is a wasteful number, since it uses less digits than its factorization.

206605605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39380.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 206605605 is about 14373.7818614309. The cubic root of 206605605 is about 591.1722408752.

The spelling of 206605605 in words is "two hundred six million, six hundred five thousand, six hundred five".