206542 has 8 divisors (see below), whose sum is σ = 354096. Its totient is φ = 88512.

The previous prime is 206527. The next prime is 206543. The reversal of 206542 is 245602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206543) by changing a digit.

206542 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, 7363 + ... + 7390.

It is an arithmetic number, because the mean of its divisors is an integer number (44262).

2²⁰⁶⁵⁴² is an apocalyptic number.

206542 is a deficient number, since it is larger than the sum of its proper divisors (147554).

206542 is a wasteful number, since it uses less digits than its factorization.

206542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14762.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 206542 is about 454.4689208296. The cubic root of 206542 is about 59.1111569127. Note that the first 4 decimals are identical.

Subtracting 206542 from its reverse (245602), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 206542 in words is "two hundred six thousand, five hundred forty-two".