13420224 has 84 divisors (see below), whose sum is σ = 40178736. Its totient is φ = 4274688.

The previous prime is 13420223. The next prime is 13420229. The reversal of 13420224 is 42202431.

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 = 13420197 and 13420206.

It is not an unprimeable number, because it can be changed into a prime (13420223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12742 + ... + 13754.

Almost surely, 2^13420224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13420224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20089368).

13420224 is an abundant number, since it is smaller than the sum of its proper divisors (26758512).

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

13420224 is a wasteful number, since it uses less digits than its factorization.

13420224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1041 counting only the distinct ones).

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

The square root of 13420224 is about 3663.3623899363. The cubic root of 13420224 is about 237.6402067795.

Adding to 13420224 its reverse (42202431), we get a palindrome (55622655).

The spelling of 13420224 in words is "thirteen million, four hundred twenty thousand, two hundred twenty-four".