206684905 has 32 divisors (see below), whose sum is σ = 296828928. Its totient is φ = 135172800.

The previous prime is 206684887. The next prime is 206684909. The reversal of 206684905 is 509486602.

It is a happy number.

It is not a de Polignac number, because 206684905 - 2¹³ = 206676713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206684909) 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 31 ways as a sum of consecutive naturals, for example, 75694 + ... + 78376.

It is an arithmetic number, because the mean of its divisors is an integer number (9275904).

Almost surely, 2^206684905 is an apocalyptic number.

It is an amenable number.

206684905 is a deficient number, since it is larger than the sum of its proper divisors (90144023).

206684905 is a wasteful number, since it uses less digits than its factorization.

206684905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 206684905 is about 14376.5400914128. The cubic root of 206684905 is about 591.2478663842.

The spelling of 206684905 in words is "two hundred six million, six hundred eighty-four thousand, nine hundred five".