206320090 has 16 divisors (see below), whose sum is σ = 373431240. Its totient is φ = 82071360.

The previous prime is 206320061. The next prime is 206320099. The reversal of 206320090 is 90023602.

It can be written as a sum of positive squares in 4 ways, for example, as 152547201 + 53772889 = 12351^2 + 7333^2 .

It is not an unprimeable number, because it can be changed into a prime (206320099) 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 7 ways as a sum of consecutive naturals, for example, 55185 + ... + 58804.

Almost surely, 2^206320090 is an apocalyptic number.

206320090 is a deficient number, since it is larger than the sum of its proper divisors (167111150).

206320090 is a wasteful number, since it uses less digits than its factorization.

206320090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114177.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 206320090 is about 14363.8466296463. The cubic root of 206320090 is about 590.8997952922.

Adding to 206320090 its reverse (90023602), we get a palindrome (296343692).

The spelling of 206320090 in words is "two hundred six million, three hundred twenty thousand, ninety".