22009440 has 48 divisors (see below), whose sum is σ = 69331248. Its totient is φ = 5869056.

The previous prime is 22009439. The next prime is 22009453. The reversal of 22009440 is 4490022.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×22009440² = 968830898227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22447 + ... + 23406.

It is an arithmetic number, because the mean of its divisors is an integer number (1444401).

Almost surely, 2^22009440 is an apocalyptic number.

22009440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22009440 is an abundant number, since it is smaller than the sum of its proper divisors (47321808).

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

22009440 is a wasteful number, since it uses less digits than its factorization.

22009440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45871 (or 45863 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 22009440 is about 4691.4219592784. The cubic root of 22009440 is about 280.2440049880.

Adding to 22009440 its reverse (4490022), we get a palindrome (26499462).

The spelling of 22009440 in words is "twenty-two million, nine thousand, four hundred forty".