22043840 has 112 divisors (see below), whose sum is σ = 64690752. Its totient is φ = 6967296.

The previous prime is 22043837. The next prime is 22043851. The reversal of 22043840 is 4834022.

It is a tau number, because it is divible by the number of its divisors (112).

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, 28742 + ... + 29498.

It is an arithmetic number, because the mean of its divisors is an integer number (577596).

Almost surely, 2^22043840 is an apocalyptic number.

22043840 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 22043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32345376).

22043840 is an abundant number, since it is smaller than the sum of its proper divisors (42646912).

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

22043840 is a wasteful number, since it uses less digits than its factorization.

22043840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 22043840 is about 4695.0867936599. The cubic root of 22043840 is about 280.3899329110.

Adding to 22043840 its reverse (4834022), we get a palindrome (26877862).

The spelling of 22043840 in words is "twenty-two million, forty-three thousand, eight hundred forty".