206705505 has 16 divisors (see below), whose sum is σ = 330908544. Its totient is φ = 110183040.

The previous prime is 206705491. The next prime is 206705507. The reversal of 206705505 is 505507602.

It is not a de Polignac number, because 206705505 - 2⁷ = 206705377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206705507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46740 + ... + 50970.

It is an arithmetic number, because the mean of its divisors is an integer number (20681784).

Almost surely, 2^206705505 is an apocalyptic number.

It is an amenable number.

206705505 is a deficient number, since it is larger than the sum of its proper divisors (124203039).

206705505 is a wasteful number, since it uses less digits than its factorization.

206705505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7496.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 206705505 is about 14377.2565185434. The cubic root of 206705505 is about 591.2675086854.

The spelling of 206705505 in words is "two hundred six million, seven hundred five thousand, five hundred five".