22023440 has 40 divisors (see below), whose sum is σ = 52055448. Its totient is φ = 8663040.

The previous prime is 22023431. The next prime is 22023457. The reversal of 22023440 is 4432022.

It can be written as a sum of positive squares in 4 ways, for example, as 2768896 + 19254544 = 1664^2 + 4388^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2624 + ... + 7136.

Almost surely, 2^22023440 is an apocalyptic number.

22023440 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 22023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26027724).

22023440 is an abundant number, since it is smaller than the sum of its proper divisors (30032008).

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

22023440 is a wasteful number, since it uses less digits than its factorization.

22023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587 (or 4581 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 22023440 is about 4692.9138070073. The cubic root of 22023440 is about 280.3034125950.

Adding to 22023440 its reverse (4432022), we get a palindrome (26455462).

The spelling of 22023440 in words is "twenty-two million, twenty-three thousand, four hundred forty".