206659540 has 24 divisors (see below), whose sum is σ = 434385000. Its totient is φ = 82587648.

The previous prime is 206659529. The next prime is 206659549. The reversal of 206659540 is 45956602.

It can be written as a sum of positive squares in 4 ways, for example, as 33315984 + 173343556 = 5772^2 + 13166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 206659540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206659549) 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, 20844 + ... + 29116.

It is an arithmetic number, because the mean of its divisors is an integer number (18099375).

Almost surely, 2^206659540 is an apocalyptic number.

206659540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206659540 is an abundant number, since it is smaller than the sum of its proper divisors (227725460).

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

206659540 is a wasteful number, since it uses less digits than its factorization.

206659540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531 (or 9529 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 206659540 is about 14375.6578979885. The cubic root of 206659540 is about 591.2236788161.

The spelling of 206659540 in words is "two hundred six million, six hundred fifty-nine thousand, five hundred forty".