206355985 has 16 divisors (see below), whose sum is σ = 274571712. Its totient is φ = 147614400.

The previous prime is 206355973. The next prime is 206355997. The reversal of 206355985 is 589553602.

It is an interprime number because it is at equal distance from previous prime (206355973) and next prime (206355997).

It is not a de Polignac number, because 206355985 - 2⁵ = 206355953 is a prime.

It is a Duffinian 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, 27399 + ... + 34108.

It is an arithmetic number, because the mean of its divisors is an integer number (17160732).

Almost surely, 2^206355985 is an apocalyptic number.

It is an amenable number.

206355985 is a deficient number, since it is larger than the sum of its proper divisors (68215727).

206355985 is a wasteful number, since it uses less digits than its factorization.

206355985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61584.

The product of its (nonzero) digits is 324000, while the sum is 43.

The square root of 206355985 is about 14365.0960665079. The cubic root of 206355985 is about 590.9340610104.

The spelling of 206355985 in words is "two hundred six million, three hundred fifty-five thousand, nine hundred eighty-five".