13220540 has 12 divisors (see below), whose sum is σ = 27763176. Its totient is φ = 5288208.

The previous prime is 13220533. The next prime is 13220551. The reversal of 13220540 is 4502231.

It is a congruent 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, 330494 + ... + 330533.

It is an arithmetic number, because the mean of its divisors is an integer number (2313598).

Almost surely, 2^13220540 is an apocalyptic number.

13220540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13220540 is an abundant number, since it is smaller than the sum of its proper divisors (14542636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13220540 is a wasteful number, since it uses less digits than its factorization.

13220540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661036 (or 661034 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 13220540 is about 3636.0060506000. The cubic root of 13220540 is about 236.4556694679.

Adding to 13220540 its reverse (4502231), we get a palindrome (17722771).

The spelling of 13220540 in words is "thirteen million, two hundred twenty thousand, five hundred forty".