13663320 has 96 divisors (see below), whose sum is σ = 45102960. Its totient is φ = 3308800.

The previous prime is 13663319. The next prime is 13663327. The reversal of 13663320 is 2336631.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14050 + ... + 14990.

Almost surely, 2^13663320 is an apocalyptic number.

13663320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13663320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22551480).

13663320 is an abundant number, since it is smaller than the sum of its proper divisors (31439640).

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

13663320 is a wasteful number, since it uses less digits than its factorization.

13663320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 13663320 is about 3696.3928362662. The cubic root of 13663320 is about 239.0665127696.

Adding to 13663320 its reverse (2336631), we get a palindrome (15999951).

The spelling of 13663320 in words is "thirteen million, six hundred sixty-three thousand, three hundred twenty".