206345 has 4 divisors (see below), whose sum is σ = 247620. Its totient is φ = 165072.

The previous prime is 206341. The next prime is 206347. The reversal of 206345 is 543602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26569 + 179776 = 163^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 206345 - 2² = 206341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20630 + ... + 20639.

It is an arithmetic number, because the mean of its divisors is an integer number (61905).

2²⁰⁶³⁴⁵ is an apocalyptic number.

It is an amenable number.

206345 is a deficient number, since it is larger than the sum of its proper divisors (41275).

206345 is an equidigital number, since it uses as much as digits as its factorization.

206345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41274.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 206345 is about 454.2521326312. The cubic root of 206345 is about 59.0923575044.

Adding to 206345 its reverse (543602), we get a palindrome (749947).

The spelling of 206345 in words is "two hundred six thousand, three hundred forty-five".