16220506 has 4 divisors (see below), whose sum is σ = 24330762. Its totient is φ = 8110252.

The previous prime is 16220489. The next prime is 16220513. The reversal of 16220506 is 60502261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60502261 = 2221 ⋅27241.

It can be written as a sum of positive squares in only one way, i.e., 16200625 + 19881 = 4025^2 + 141^2 .

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 an unprimeable number.

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 as a sum of consecutive naturals, namely, 4055125 + ... + 4055128.

Almost surely, 2^16220506 is an apocalyptic number.

16220506 is a deficient number, since it is larger than the sum of its proper divisors (8110256).

16220506 is an equidigital number, since it uses as much as digits as its factorization.

16220506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110255.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16220506 is about 4027.4689322203. The cubic root of 16220506 is about 253.1365164907.

Adding to 16220506 its reverse (60502261), we get a palindrome (76722767).

The spelling of 16220506 in words is "sixteen million, two hundred twenty thousand, five hundred six".