12556220 has 12 divisors (see below), whose sum is σ = 26368104. Its totient is φ = 5022480.

The previous prime is 12556213. The next prime is 12556223. The reversal of 12556220 is 2265521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12556223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313886 + ... + 313925.

It is an arithmetic number, because the mean of its divisors is an integer number (2197342).

Almost surely, 2^12556220 is an apocalyptic number.

12556220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12556220 is an abundant number, since it is smaller than the sum of its proper divisors (13811884).

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

12556220 is a wasteful number, since it uses less digits than its factorization.

12556220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627820 (or 627818 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 12556220 is about 3543.4756948510. The cubic root of 12556220 is about 232.4268548572.

The spelling of 12556220 in words is "twelve million, five hundred fifty-six thousand, two hundred twenty".