13220505 has 24 divisors (see below), whose sum is σ = 23180040. Its totient is φ = 6969600.

The previous prime is 13220461. The next prime is 13220521. The reversal of 13220505 is 50502231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 13220496 = 3^2 + 3636^2 .

It is not a de Polignac number, because 13220505 - 2¹⁵ = 13187737 is a prime.

It is a congruent 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 in 23 ways as a sum of consecutive naturals, for example, 2355 + ... + 5655.

It is an arithmetic number, because the mean of its divisors is an integer number (965835).

Almost surely, 2^13220505 is an apocalyptic number.

13220505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220505 is a deficient number, since it is larger than the sum of its proper divisors (9959535).

13220505 is a wasteful number, since it uses less digits than its factorization.

13220505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401 (or 3398 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 13220505 is about 3636.0012376236. The cubic root of 13220505 is about 236.4554608038.

Adding to 13220505 its reverse (50502231), we get a palindrome (63722736).

The spelling of 13220505 in words is "thirteen million, two hundred twenty thousand, five hundred five".