206660 has 12 divisors (see below), whose sum is σ = 434028. Its totient is φ = 82656.

The previous prime is 206651. The next prime is 206699. The reversal of 206660 is 66602.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 92416 = 338^2 + 304^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10333 = 206660 / (2 + 0 + 6 + 6 + 6 + 0).

It is an unprimeable number.

206660 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 3 ways as a sum of consecutive naturals, for example, 5147 + ... + 5186.

It is an arithmetic number, because the mean of its divisors is an integer number (36169).

2²⁰⁶⁶⁶⁰ is an apocalyptic number.

206660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206660 is an abundant number, since it is smaller than the sum of its proper divisors (227368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206660 is a wasteful number, since it uses less digits than its factorization.

206660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342 (or 10340 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 206660 is about 454.5987241513. The cubic root of 206660 is about 59.1224117481.

The spelling of 206660 in words is "two hundred six thousand, six hundred sixty".