22018040 has 64 divisors (see below), whose sum is σ = 54552960. Its totient is φ = 7931520.

The previous prime is 22018039. The next prime is 22018049. The reversal of 22018040 is 4081022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22018049) 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, 71567 + ... + 71873.

It is an arithmetic number, because the mean of its divisors is an integer number (852390).

Almost surely, 2^22018040 is an apocalyptic number.

22018040 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 22018040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27276480).

22018040 is an abundant number, since it is smaller than the sum of its proper divisors (32534920).

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

22018040 is a wasteful number, since it uses less digits than its factorization.

22018040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 488 counting only the distinct ones).

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

The square root of 22018040 is about 4692.3384362171. The cubic root of 22018040 is about 280.2805012158.

Adding to 22018040 its reverse (4081022), we get a palindrome (26099062).

The spelling of 22018040 in words is "twenty-two million, eighteen thousand, forty".