206840 has 16 divisors (see below), whose sum is σ = 465480. Its totient is φ = 82720.

The previous prime is 206827. The next prime is 206879. The reversal of 206840 is 48602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2546 + ... + 2625.

2²⁰⁶⁸⁴⁰ is an apocalyptic number.

206840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206840 is an abundant number, since it is smaller than the sum of its proper divisors (258640).

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

206840 is a wasteful number, since it uses less digits than its factorization.

206840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182 (or 5178 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 206840 is about 454.7966578593. The cubic root of 206840 is about 59.1395718918.

The spelling of 206840 in words is "two hundred six thousand, eight hundred forty".