13618220 has 96 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 4112640.

The previous prime is 13618217. The next prime is 13618249. The reversal of 13618220 is 2281631.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56861 + ... + 57099.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^13618220 is an apocalyptic number.

13618220 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 13618220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18385920).

13618220 is an abundant number, since it is smaller than the sum of its proper divisors (23153620).

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

13618220 is a wasteful number, since it uses less digits than its factorization.

13618220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 13618220 is about 3690.2872516919. The cubic root of 13618220 is about 238.8031852493.

Adding to 13618220 its reverse (2281631), we get a palindrome (15899851).

The spelling of 13618220 in words is "thirteen million, six hundred eighteen thousand, two hundred twenty".