206642320 has 20 divisors (see below), whose sum is σ = 480443580. Its totient is φ = 82656896.

The previous prime is 206642297. The next prime is 206642351. The reversal of 206642320 is 23246602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 129413376 + 77228944 = 11376^2 + 8788^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291435 + ... + 1291594.

It is an arithmetic number, because the mean of its divisors is an integer number (24022179).

Almost surely, 2^206642320 is an apocalyptic number.

206642320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206642320 is an abundant number, since it is smaller than the sum of its proper divisors (273801260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206642320 is a wasteful number, since it uses less digits than its factorization.

206642320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583042 (or 2583036 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 206642320 is about 14375.0589564008. The cubic root of 206642320 is about 591.2072570328.

Adding to 206642320 its reverse (23246602), we get a palindrome (229888922).

The spelling of 206642320 in words is "two hundred six million, six hundred forty-two thousand, three hundred twenty".