22381056 has 80 divisors (see below), whose sum is σ = 66290400. Its totient is φ = 7455744.

The previous prime is 22381049. The next prime is 22381057. The reversal of 22381056 is 65018322.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22381057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13015 + ... + 14633.

It is an arithmetic number, because the mean of its divisors is an integer number (828630).

Almost surely, 2^22381056 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 22381056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33145200).

22381056 is an abundant number, since it is smaller than the sum of its proper divisors (43909344).

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

22381056 is an equidigital number, since it uses as much as digits as its factorization.

22381056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 22381056 is about 4730.8620778881. The cubic root of 22381056 is about 281.8124601872.

Adding to 22381056 its reverse (65018322), we get a palindrome (87399378).

The spelling of 22381056 in words is "twenty-two million, three hundred eighty-one thousand, fifty-six".