206690885 has 8 divisors (see below), whose sum is σ = 249463800. Its totient is φ = 164396224.

The previous prime is 206690851. The next prime is 206690893. The reversal of 206690885 is 588096602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15864289 + 190826596 = 3983^2 + 13814^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 206690885 - 2¹² = 206686789 is a prime.

It is a super-2 number, since 2×206690885² = 85442243884166450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 118610 + ... + 120339.

It is an arithmetic number, because the mean of its divisors is an integer number (31182975).

Almost surely, 2^206690885 is an apocalyptic number.

It is an amenable number.

206690885 is a deficient number, since it is larger than the sum of its proper divisors (42772915).

206690885 is a wasteful number, since it uses less digits than its factorization.

206690885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239127.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 206690885 is about 14376.7480676264. The cubic root of 206690885 is about 591.2535685071.

The spelling of 206690885 in words is "two hundred six million, six hundred ninety thousand, eight hundred eighty-five".