16808305 has 4 divisors (see below), whose sum is σ = 20169972. Its totient is φ = 13446640.

The previous prime is 16808299. The next prime is 16808321. The reversal of 16808305 is 50380861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 5193841 = 3408^2 + 2279^2 .

It is not a de Polignac number, because 16808305 - 2¹⁹ = 16284017 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 1680826 + ... + 1680835.

It is an arithmetic number, because the mean of its divisors is an integer number (5042493).

Almost surely, 2^16808305 is an apocalyptic number.

It is an amenable number.

16808305 is a deficient number, since it is larger than the sum of its proper divisors (3361667).

16808305 is an equidigital number, since it uses as much as digits as its factorization.

16808305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361666.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 16808305 is about 4099.7932874719. The cubic root of 16808305 is about 256.1580292592.

The spelling of 16808305 in words is "sixteen million, eight hundred eight thousand, three hundred five".