22091440 has 80 divisors (see below), whose sum is σ = 59424768. Its totient is φ = 7481088.

The previous prime is 22091423. The next prime is 22091453. The reversal of 22091440 is 4419022.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57489 + ... + 57871.

Almost surely, 2^22091440 is an apocalyptic number.

22091440 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 22091440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29712384).

22091440 is an abundant number, since it is smaller than the sum of its proper divisors (37333328).

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

22091440 is a wasteful number, since it uses less digits than its factorization.

22091440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22091440 is about 4700.1531889929. The cubic root of 22091440 is about 280.5916062697.

The spelling of 22091440 in words is "twenty-two million, ninety-one thousand, four hundred forty".