22040000 has 140 divisors (see below), whose sum is σ = 59512200. Its totient is φ = 8064000.

The previous prime is 22039999. The next prime is 22040009. The reversal of 22040000 is 4022.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22040000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22040009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 759986 + ... + 760014.

Almost surely, 2^22040000 is an apocalyptic number.

22040000 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 22040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29756100).

22040000 is an abundant number, since it is smaller than the sum of its proper divisors (37472200).

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

22040000 is an equidigital number, since it uses as much as digits as its factorization.

22040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 55 counting only the distinct ones).

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

The square root of 22040000 is about 4694.6778377222. The cubic root of 22040000 is about 280.3736508133.

Adding to 22040000 its reverse (4022), we get a palindrome (22044022).

The spelling of 22040000 in words is "twenty-two million, forty thousand".