206820066 has 8 divisors (see below), whose sum is σ = 413640144. Its totient is φ = 68940020.

The previous prime is 206820059. The next prime is 206820077. The reversal of 206820066 is 660028602.

206820066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

206820066 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17235000 + ... + 17235011.

It is an arithmetic number, because the mean of its divisors is an integer number (51705018).

Almost surely, 2^206820066 is an apocalyptic number.

206820066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

206820066 is a wasteful number, since it uses less digits than its factorization.

206820066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34470016.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 206820066 is about 14381.2400717045. The cubic root of 206820066 is about 591.3767199152.

Adding to 206820066 its reverse (660028602), we get a palindrome (866848668).

The spelling of 206820066 in words is "two hundred six million, eight hundred twenty thousand, sixty-six".