22240640 has 128 divisors (see below), whose sum is σ = 58752000. Its totient is φ = 8017920.

The previous prime is 22240637. The next prime is 22240643. The reversal of 22240640 is 4604222.

It is an interprime number because it is at equal distance from previous prime (22240637) and next prime (22240643).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22240643) 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, 376931 + ... + 376989.

It is an arithmetic number, because the mean of its divisors is an integer number (459000).

Almost surely, 2^22240640 is an apocalyptic number.

22240640 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 22240640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29376000).

22240640 is an abundant number, since it is smaller than the sum of its proper divisors (36511360).

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

22240640 is a wasteful number, since it uses less digits than its factorization.

22240640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22240640 is about 4715.9983036469. The cubic root of 22240640 is about 281.2218710963.

Adding to 22240640 its reverse (4604222), we get a palindrome (26844862).

The spelling of 22240640 in words is "twenty-two million, two hundred forty thousand, six hundred forty".