206808208440 has 64 divisors (see below), whose sum is σ = 620657350560. Its totient is φ = 55128168960.

The previous prime is 206808208339. The next prime is 206808208441. The reversal of 206808208440 is 44802808602.

It is a junction number, because it is equal to n+sod(n) for n = 206808208392 and 206808208401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206808208441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651 + ... + 643130.

Almost surely, 2^206808208440 is an apocalyptic number.

206808208440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206808208440 is an abundant number, since it is smaller than the sum of its proper divisors (413849142120).

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

206808208440 is a wasteful number, since it uses less digits than its factorization.

206808208440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646472 (or 646468 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 42.

The spelling of 206808208440 in words is "two hundred six billion, eight hundred eight million, two hundred eight thousand, four hundred forty".