13224420 has 72 divisors (see below), whose sum is σ = 43767360. Its totient is φ = 3205440.

The previous prime is 13224391. The next prime is 13224457. The reversal of 13224420 is 2442231.

13224420 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 Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13224393 and 13224402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1360 + ... + 5319.

It is an arithmetic number, because the mean of its divisors is an integer number (607880).

Almost surely, 2^13224420 is an apocalyptic number.

13224420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13224420 is an abundant number, since it is smaller than the sum of its proper divisors (30542940).

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

13224420 is a wasteful number, since it uses less digits than its factorization.

13224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6705 (or 6700 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13224420 is about 3636.5395639261. The cubic root of 13224420 is about 236.4787990894.

Adding to 13224420 its reverse (2442231), we get a palindrome (15666651).

The spelling of 13224420 in words is "thirteen million, two hundred twenty-four thousand, four hundred twenty".