206690 has 16 divisors (see below), whose sum is σ = 406080. Its totient is φ = 75120.

The previous prime is 206651. The next prime is 206699. The reversal of 206690 is 96602.

206690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×206690² = 85441512200, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (206699) by changing a digit.

206690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (25380).

2²⁰⁶⁶⁹⁰ is an apocalyptic number.

206690 is a deficient number, since it is larger than the sum of its proper divisors (199390).

206690 is a wasteful number, since it uses less digits than its factorization.

206690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 206690 is about 454.6317190870. The cubic root of 206690 is about 59.1252724638.

The spelling of 206690 in words is "two hundred six thousand, six hundred ninety".