206689660 has 24 divisors (see below), whose sum is σ = 434505456. Its totient is φ = 82588800.

The previous prime is 206689633. The next prime is 206689669. The reversal of 206689660 is 66986602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206689669) 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, 16104 + ... + 25936.

It is an arithmetic number, because the mean of its divisors is an integer number (18104394).

Almost surely, 2^206689660 is an apocalyptic number.

206689660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206689660 is an abundant number, since it is smaller than the sum of its proper divisors (227815796).

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

206689660 is a wasteful number, since it uses less digits than its factorization.

206689660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10893 (or 10891 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 206689660 is about 14376.7054640484. The cubic root of 206689660 is about 591.2524004390.

The spelling of 206689660 in words is "two hundred six million, six hundred eighty-nine thousand, six hundred sixty".