206406506 has 8 divisors (see below), whose sum is σ = 309868644. Its totient is φ = 103116960.

The previous prime is 206406449. The next prime is 206406611. The reversal of 206406506 is 605604602.

It can be written as a sum of positive squares in 2 ways, for example, as 206180881 + 225625 = 14359^2 + 475^2 .

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

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 40115 + ... + 44966.

Almost surely, 2^206406506 is an apocalyptic number.

206406506 is a deficient number, since it is larger than the sum of its proper divisors (103462138).

206406506 is a wasteful number, since it uses less digits than its factorization.

206406506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86296.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 206406506 is about 14366.8544225937. The cubic root of 206406506 is about 590.9822821200.

The spelling of 206406506 in words is "two hundred six million, four hundred six thousand, five hundred six".