22655440 has 20 divisors (see below), whose sum is σ = 52674084. Its totient is φ = 9062144.

The previous prime is 22655419. The next prime is 22655443. The reversal of 22655440 is 4455622.

It can be written as a sum of positive squares in 2 ways, for example, as 17673616 + 4981824 = 4204^2 + 2232^2 .

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 = 22655399 and 22655408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22655443) 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, 141517 + ... + 141676.

Almost surely, 2^22655440 is an apocalyptic number.

22655440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22655440 is an abundant number, since it is smaller than the sum of its proper divisors (30018644).

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

22655440 is a wasteful number, since it uses less digits than its factorization.

22655440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283206 (or 283200 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 22655440 is about 4759.7731038359. The cubic root of 22655440 is about 282.9594268146.

The spelling of 22655440 in words is "twenty-two million, six hundred fifty-five thousand, four hundred forty".