22214640 has 120 divisors (see below), whose sum is σ = 80151120. Its totient is φ = 5074944.

The previous prime is 22214627. The next prime is 22214641. The reversal of 22214640 is 4641222.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22214641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10816 + ... + 12704.

It is an arithmetic number, because the mean of its divisors is an integer number (667926).

Almost surely, 2^22214640 is an apocalyptic number.

22214640 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 22214640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40075560).

22214640 is an abundant number, since it is smaller than the sum of its proper divisors (57936480).

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

22214640 is a wasteful number, since it uses less digits than its factorization.

22214640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 22214640 is about 4713.2409231865. The cubic root of 22214640 is about 281.1122426604.

Adding to 22214640 its reverse (4641222), we get a palindrome (26855862).

The spelling of 22214640 in words is "twenty-two million, two hundred fourteen thousand, six hundred forty".