22220256 has 24 divisors (see below), whose sum is σ = 58328424. Its totient is φ = 7406720.

The previous prime is 22220249. The next prime is 22220257. The reversal of 22220256 is 65202222.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220257) 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 3 ways as a sum of consecutive naturals, for example, 115635 + ... + 115826.

It is an arithmetic number, because the mean of its divisors is an integer number (2430351).

Almost surely, 2^22220256 is an apocalyptic number.

It is an amenable number.

22220256 is an abundant number, since it is smaller than the sum of its proper divisors (36108168).

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

22220256 is a wasteful number, since it uses less digits than its factorization.

22220256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231474 (or 231466 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 22220256 is about 4713.8366539370. The cubic root of 22220256 is about 281.1359296424.

Adding to 22220256 its reverse (65202222), we get a palindrome (87422478).

The spelling of 22220256 in words is "twenty-two million, two hundred twenty thousand, two hundred fifty-six".