22209640 has 32 divisors (see below), whose sum is σ = 51586560. Its totient is φ = 8596800.

The previous prime is 22209637. The next prime is 22209641. The reversal of 22209640 is 4690222.

It is not an unprimeable number, because it can be changed into a prime (22209641) 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 7 ways as a sum of consecutive naturals, for example, 7716 + ... + 10195.

It is an arithmetic number, because the mean of its divisors is an integer number (1612080).

Almost surely, 2^22209640 is an apocalyptic number.

22209640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22209640 is an abundant number, since it is smaller than the sum of its proper divisors (29376920).

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

22209640 is a wasteful number, since it uses less digits than its factorization.

22209640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17953 (or 17949 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 22209640 is about 4712.7104727534. The cubic root of 22209640 is about 281.0911504635.

Adding to 22209640 its reverse (4690222), we get a palindrome (26899862).

The spelling of 22209640 in words is "twenty-two million, two hundred nine thousand, six hundred forty".