22253440 has 128 divisors (see below), whose sum is σ = 60588000. Its totient is φ = 7741440.

The previous prime is 22253437. The next prime is 22253501. The reversal of 22253440 is 4435222.

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 (22).

It is a congruent number.

It is an unprimeable number.

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, 204106 + ... + 204214.

Almost surely, 2^22253440 is an apocalyptic number.

22253440 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 22253440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30294000).

22253440 is an abundant number, since it is smaller than the sum of its proper divisors (38334560).

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

22253440 is a wasteful number, since it uses less digits than its factorization.

22253440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 22253440 is about 4717.3551912062. The cubic root of 22253440 is about 281.2758106354.

Adding to 22253440 its reverse (4435222), we get a palindrome (26688662).

It can be divided in two parts, 2225 and 3440, that added together give a palindrome (5665).

The spelling of 22253440 in words is "twenty-two million, two hundred fifty-three thousand, four hundred forty".