22004400 has 120 divisors (see below), whose sum is σ = 76941504. Its totient is φ = 5331200.

The previous prime is 22004393. The next prime is 22004419. The reversal of 22004400 is 440022.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12367 + ... + 14033.

Almost surely, 2^22004400 is an apocalyptic number.

22004400 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 22004400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38470752).

22004400 is an abundant number, since it is smaller than the sum of its proper divisors (54937104).

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

22004400 is a wasteful number, since it uses less digits than its factorization.

22004400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699 (or 1688 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 22004400 is about 4690.8847779497. The cubic root of 22004400 is about 280.2226120825. Note that the first 3 decimals are identical.

Adding to 22004400 its reverse (440022), we get a palindrome (22444422).

The spelling of 22004400 in words is "twenty-two million, four thousand, four hundred".