206218090 has 32 divisors (see below), whose sum is σ = 401299920. Its totient is φ = 75846144.

The previous prime is 206218079. The next prime is 206218091. The reversal of 206218090 is 90812602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 48288601 + 157929489 = 6949^2 + 12567^2 .

It is not an unprimeable number, because it can be changed into a prime (206218091) 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, 32022 + ... + 37918.

Almost surely, 2^206218090 is an apocalyptic number.

206218090 is a deficient number, since it is larger than the sum of its proper divisors (195081830).

206218090 is a wasteful number, since it uses less digits than its factorization.

206218090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 206218090 is about 14360.2956097707. The cubic root of 206218090 is about 590.8024033963.

The spelling of 206218090 in words is "two hundred six million, two hundred eighteen thousand, ninety".