206305 has 16 divisors (see below), whose sum is σ = 281088. Its totient is φ = 145200.

The previous prime is 206303. The next prime is 206341. The reversal of 206305 is 503602.

206305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206305 - 2¹ = 206303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6640 + ... + 6670.

It is an arithmetic number, because the mean of its divisors is an integer number (17568).

2²⁰⁶³⁰⁵ is an apocalyptic number.

It is an amenable number.

206305 is a deficient number, since it is larger than the sum of its proper divisors (74783).

206305 is an equidigital number, since it uses as much as digits as its factorization.

206305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 206305 is about 454.2081020854. The cubic root of 206305 is about 59.0885389044.

Adding to 206305 its reverse (503602), we get a palindrome (709907).

The spelling of 206305 in words is "two hundred six thousand, three hundred five".