11518220 has 48 divisors (see below), whose sum is σ = 28607040. Its totient is φ = 3811584.

The previous prime is 11518219. The next prime is 11518223. The reversal of 11518220 is 2281511.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11518192 and 11518201.

It is not an unprimeable number, because it can be changed into a prime (11518223) 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 15 ways as a sum of consecutive naturals, for example, 2642 + ... + 5478.

It is an arithmetic number, because the mean of its divisors is an integer number (595980).

Almost surely, 2^11518220 is an apocalyptic number.

11518220 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 11518220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14303520).

11518220 is an abundant number, since it is smaller than the sum of its proper divisors (17088820).

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

11518220 is a wasteful number, since it uses less digits than its factorization.

11518220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 11518220 is about 3393.8503208008. The cubic root of 11518220 is about 225.8370140814.

Adding to 11518220 its reverse (2281511), we get a palindrome (13799731).

The spelling of 11518220 in words is "eleven million, five hundred eighteen thousand, two hundred twenty".