206642 has 8 divisors (see below), whose sum is σ = 311916. Its totient is φ = 102672.

The previous prime is 206641. The next prime is 206651. The reversal of 206642 is 246602.

206642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 5041 = 449^2 + 71^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (206641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368 + ... + 740.

2²⁰⁶⁶⁴² is an apocalyptic number.

206642 is a deficient number, since it is larger than the sum of its proper divisors (105274).

206642 is a wasteful number, since it uses less digits than its factorization.

206642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 206642 is about 454.5789260404. The cubic root of 206642 is about 59.1206951857.

It can be divided in two parts, 20664 and 2, that multiplied together give a triangular number (41328 = T₂₈₇).

The spelling of 206642 in words is "two hundred six thousand, six hundred forty-two".