13220304 has 20 divisors (see below), whose sum is σ = 34152576. Its totient is φ = 4406752.

The previous prime is 13220287. The next prime is 13220309. The reversal of 13220304 is 40302231.

13220304 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137664 + ... + 137759.

Almost surely, 2^13220304 is an apocalyptic number.

It is an amenable number.

13220304 is an abundant number, since it is smaller than the sum of its proper divisors (20932272).

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

13220304 is a wasteful number, since it uses less digits than its factorization.

13220304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275434 (or 275428 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 13220304 is about 3635.9735972639. The cubic root of 13220304 is about 236.4542624686.

Adding to 13220304 its reverse (40302231), we get a palindrome (53522535).

The spelling of 13220304 in words is "thirteen million, two hundred twenty thousand, three hundred four".