12218020 has 24 divisors (see below), whose sum is σ = 26256384. Its totient is φ = 4773216.

The previous prime is 12217993. The next prime is 12218027. The reversal of 12218020 is 2081221.

It is a junction number, because it is equal to n+sod(n) for n = 12217985 and 12218003.

It is not an unprimeable number, because it can be changed into a prime (12218027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6244 + ... + 7963.

It is an arithmetic number, because the mean of its divisors is an integer number (1094016).

Almost surely, 2^12218020 is an apocalyptic number.

12218020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12218020 is an abundant number, since it is smaller than the sum of its proper divisors (14038364).

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

12218020 is a wasteful number, since it uses less digits than its factorization.

12218020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14259 (or 14257 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 12218020 is about 3495.4284429809. The cubic root of 12218020 is about 230.3210387615.

Adding to 12218020 its reverse (2081221), we get a palindrome (14299241).

The spelling of 12218020 in words is "twelve million, two hundred eighteen thousand, twenty".