22453840 has 20 divisors (see below), whose sum is σ = 52205364. Its totient is φ = 8981504.

The previous prime is 22453817. The next prime is 22453841. The reversal of 22453840 is 4835422.

It can be written as a sum of positive squares in 2 ways, for example, as 6677056 + 15776784 = 2584^2 + 3972^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 22453799 and 22453808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22453841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140257 + ... + 140416.

Almost surely, 2^22453840 is an apocalyptic number.

22453840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22453840 is an abundant number, since it is smaller than the sum of its proper divisors (29751524).

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

22453840 is a wasteful number, since it uses less digits than its factorization.

22453840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280686 (or 280680 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 22453840 is about 4738.5483009040. The cubic root of 22453840 is about 282.1176177207.

The spelling of 22453840 in words is "twenty-two million, four hundred fifty-three thousand, eight hundred forty".