22040 has 32 divisors (see below), whose sum is σ = 54000. Its totient is φ = 8064.

The previous prime is 22039. The next prime is 22051. The reversal of 22040 is 4022.

It is a Harshad number since it is a multiple of its sum of digits (8).

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, 746 + ... + 774.

2²²⁰⁴⁰ is an apocalyptic number.

22040 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 22040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27000).

22040 is an abundant number, since it is smaller than the sum of its proper divisors (31960).

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

22040 is a wasteful number, since it uses less digits than its factorization.

22040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 22040 is about 148.4587484792. The cubic root of 22040 is about 28.0373650813.

Adding to 22040 its reverse (4022), we get a palindrome (26062).

The spelling of 22040 in words is "twenty-two thousand, forty", and thus it is an iban number.