206671305 has 16 divisors (see below), whose sum is σ = 330995520. Its totient is φ = 110117568.

The previous prime is 206671301. The next prime is 206671343. The reversal of 206671305 is 503176602.

It is not a de Polignac number, because 206671305 - 2² = 206671301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206671301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10711 + ... + 22979.

It is an arithmetic number, because the mean of its divisors is an integer number (20687220).

Almost surely, 2^206671305 is an apocalyptic number.

It is an amenable number.

206671305 is a deficient number, since it is larger than the sum of its proper divisors (124324215).

206671305 is a wasteful number, since it uses less digits than its factorization.

206671305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13400.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 206671305 is about 14376.0670908284. The cubic root of 206671305 is about 591.2348979362.

The spelling of 206671305 in words is "two hundred six million, six hundred seventy-one thousand, three hundred five".