22243540 has 24 divisors (see below), whose sum is σ = 50958432. Its totient is φ = 8088480.

The previous prime is 22243537. The next prime is 22243541. The reversal of 22243540 is 4534222.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22243541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50334 + ... + 50773.

It is an arithmetic number, because the mean of its divisors is an integer number (2123268).

Almost surely, 2^22243540 is an apocalyptic number.

22243540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22243540 is an abundant number, since it is smaller than the sum of its proper divisors (28714892).

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

22243540 is a wasteful number, since it uses less digits than its factorization.

22243540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101127 (or 101125 counting only the distinct ones).

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

The square root of 22243540 is about 4716.3057576879. The cubic root of 22243540 is about 281.2340935860.

Adding to 22243540 its reverse (4534222), we get a palindrome (26777762).

The spelling of 22243540 in words is "twenty-two million, two hundred forty-three thousand, five hundred forty".