22643340 has 48 divisors (see below), whose sum is σ = 64012032. Its totient is φ = 5980096.

The previous prime is 22643317. The next prime is 22643347. The reversal of 22643340 is 4334622.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22643340.

It is not an unprimeable number, because it can be changed into a prime (22643347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4657 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (1333584).

Almost surely, 2^22643340 is an apocalyptic number.

22643340 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 22643340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32006016).

22643340 is an abundant number, since it is smaller than the sum of its proper divisors (41368692).

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

22643340 is a wasteful number, since it uses less digits than its factorization.

22643340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 22643340 is about 4758.5018650832. The cubic root of 22643340 is about 282.9090427599.

Adding to 22643340 its reverse (4334622), we get a palindrome (26977962).

The spelling of 22643340 in words is "twenty-two million, six hundred forty-three thousand, three hundred forty".