13220530 has 16 divisors (see below), whose sum is σ = 24188184. Its totient is φ = 5201280.

The previous prime is 13220527. The next prime is 13220533. The reversal of 13220530 is 3502231.

It is an interprime number because it is at equal distance from previous prime (13220527) and next prime (13220533).

It can be written as a sum of positive squares in 4 ways, for example, as 10949481 + 2271049 = 3309^2 + 1507^2 .

It is not an unprimeable number, because it can be changed into a prime (13220533) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 10227 + ... + 11446.

Almost surely, 2^13220530 is an apocalyptic number.

13220530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13220530 is a deficient number, since it is larger than the sum of its proper divisors (10967654).

13220530 is a wasteful number, since it uses less digits than its factorization.

13220530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21741.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 13220530 is about 3636.0046754645. The cubic root of 13220530 is about 236.4556098496.

Adding to 13220530 its reverse (3502231), we get a palindrome (16722761).

The spelling of 13220530 in words is "thirteen million, two hundred twenty thousand, five hundred thirty".