206540 has 24 divisors (see below), whose sum is σ = 453600. Its totient is φ = 78848.

The previous prime is 206527. The next prime is 206543. The reversal of 206540 is 45602.

206540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206540.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 684.

It is an arithmetic number, because the mean of its divisors is an integer number (18900).

2²⁰⁶⁵⁴⁰ is an apocalyptic number.

206540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226800).

206540 is an abundant number, since it is smaller than the sum of its proper divisors (247060).

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

206540 is a wasteful number, since it uses less digits than its factorization.

206540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 206540 is about 454.4667204538. The cubic root of 206540 is about 59.1109661159.

The spelling of 206540 in words is "two hundred six thousand, five hundred forty".