22226640 has 80 divisors (see below), whose sum is σ = 70793088. Its totient is φ = 5764608.

The previous prime is 22226627. The next prime is 22226641. The reversal of 22226640 is 4662222.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 22226640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22226641) 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 15 ways as a sum of consecutive naturals, for example, 7629 + ... + 10131.

Almost surely, 2^22226640 is an apocalyptic number.

22226640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22226640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35396544).

22226640 is an abundant number, since it is smaller than the sum of its proper divisors (48566448).

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

22226640 is a wasteful number, since it uses less digits than its factorization.

22226640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 22226640 is about 4714.5137607181. The cubic root of 22226640 is about 281.1628510232.

Adding to 22226640 its reverse (4662222), we get a palindrome (26888862).

It can be divided in two parts, 222 and 26640, that added together give a palindrome (26862).

The spelling of 22226640 in words is "twenty-two million, two hundred twenty-six thousand, six hundred forty".