206640213 has 8 divisors (see below), whose sum is σ = 296714208. Its totient is φ = 127163184.

The previous prime is 206640197. The next prime is 206640233. The reversal of 206640213 is 312046602.

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

It is not a de Polignac number, because 206640213 - 2⁴ = 206640197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206640233) 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 7 ways as a sum of consecutive naturals, for example, 2649195 + ... + 2649272.

It is an arithmetic number, because the mean of its divisors is an integer number (37089276).

Almost surely, 2^206640213 is an apocalyptic number.

It is an amenable number.

206640213 is a deficient number, since it is larger than the sum of its proper divisors (90073995).

206640213 is a wasteful number, since it uses less digits than its factorization.

206640213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298483.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 206640213 is about 14374.9856695581. The cubic root of 206640213 is about 591.2052476382.

Adding to 206640213 its reverse (312046602), we get a palindrome (518686815).

The spelling of 206640213 in words is "two hundred six million, six hundred forty thousand, two hundred thirteen".