16320505 has 4 divisors (see below), whose sum is σ = 19584612. Its totient is φ = 13056400.

The previous prime is 16320481. The next prime is 16320517. The reversal of 16320505 is 50502361.

It is a happy number.

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 9308601 + 7011904 = 3051^2 + 2648^2 .

It is not a de Polignac number, because 16320505 - 2¹⁵ = 16287737 is a prime.

It is a Smith number, since the sum of its digits (22) 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, 1632046 + ... + 1632055.

It is an arithmetic number, because the mean of its divisors is an integer number (4896153).

Almost surely, 2^16320505 is an apocalyptic number.

It is an amenable number.

16320505 is a deficient number, since it is larger than the sum of its proper divisors (3264107).

16320505 is an equidigital number, since it uses as much as digits as its factorization.

16320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264106.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 16320505 is about 4039.8644779250. The cubic root of 16320505 is about 253.6556445033.

Adding to 16320505 its reverse (50502361), we get a palindrome (66822866).

The spelling of 16320505 in words is "sixteen million, three hundred twenty thousand, five hundred five".