12256220 has 12 divisors (see below), whose sum is σ = 25738104. Its totient is φ = 4902480.

The previous prime is 12256207. The next prime is 12256271. The reversal of 12256220 is 2265221.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 612811 = 12256220 / (1 + 2 + 2 + 5 + 6 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 12256192 and 12256201.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 306386 + ... + 306425.

It is an arithmetic number, because the mean of its divisors is an integer number (2144842).

Almost surely, 2^12256220 is an apocalyptic number.

12256220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12256220 is an abundant number, since it is smaller than the sum of its proper divisors (13481884).

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

12256220 is a wasteful number, since it uses less digits than its factorization.

12256220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612820 (or 612818 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12256220 is about 3500.8884586630. Note that the first 3 decimals coincide. The cubic root of 12256220 is about 230.5608242104.

Subtracting from 12256220 its reverse (2265221), we obtain a palindrome (9990999).

The spelling of 12256220 in words is "twelve million, two hundred fifty-six thousand, two hundred twenty".