22543840 has 48 divisors (see below), whose sum is σ = 58106160. Its totient is φ = 8197120.

The previous prime is 22543837. The next prime is 22543877. The reversal of 22543840 is 4834522.

It is a junction number, because it is equal to n+sod(n) for n = 22543799 and 22543808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4645 + ... + 8164.

It is an arithmetic number, because the mean of its divisors is an integer number (1210545).

Almost surely, 2^22543840 is an apocalyptic number.

22543840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22543840 is an abundant number, since it is smaller than the sum of its proper divisors (35562320).

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

22543840 is a wasteful number, since it uses less digits than its factorization.

22543840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12835 (or 12827 counting only the distinct ones).

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

The square root of 22543840 is about 4748.0353831875. The cubic root of 22543840 is about 282.4940453492.

The spelling of 22543840 in words is "twenty-two million, five hundred forty-three thousand, eight hundred forty".