12220056 has 48 divisors (see below), whose sum is σ = 33485400. Its totient is φ = 4025472.

The previous prime is 12220037. The next prime is 12220081. The reversal of 12220056 is 65002221.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 5455 + ... + 7361.

Almost surely, 2^12220056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12220056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16742700).

12220056 is an abundant number, since it is smaller than the sum of its proper divisors (21265344).

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

12220056 is a wasteful number, since it uses less digits than its factorization.

12220056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008 (or 2001 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12220056 is about 3495.7196683945. The cubic root of 12220056 is about 230.3338315487. Note that the first 3 decimals are identical.

Adding to 12220056 its reverse (65002221), we get a palindrome (77222277).

The spelling of 12220056 in words is "twelve million, two hundred twenty thousand, fifty-six".