22081040 has 80 divisors (see below), whose sum is σ = 55056000. Its totient is φ = 8211456.

The previous prime is 22081039. The next prime is 22081043. The reversal of 22081040 is 4018022.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (22081043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110861 + ... + 111059.

It is an arithmetic number, because the mean of its divisors is an integer number (688200).

Almost surely, 2^22081040 is an apocalyptic number.

22081040 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 22081040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27528000).

22081040 is an abundant number, since it is smaller than the sum of its proper divisors (32974960).

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

22081040 is a wasteful number, since it uses less digits than its factorization.

22081040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 22081040 is about 4699.0467118342. The cubic root of 22081040 is about 280.5475679340.

Adding to 22081040 its reverse (4018022), we get a palindrome (26099062).

The spelling of 22081040 in words is "twenty-two million, eighty-one thousand, forty".