22066720 has 72 divisors (see below), whose sum is σ = 56693196. Its totient is φ = 8068608.

The previous prime is 22066691. The next prime is 22066721. The reversal of 22066720 is 2766022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20539024 + 1527696 = 4532^2 + 1236^2 .

It is not an unprimeable number, because it can be changed into a prime (22066721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214189 + ... + 214291.

Almost surely, 2^22066720 is an apocalyptic number.

22066720 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 22066720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28346598).

22066720 is an abundant number, since it is smaller than the sum of its proper divisors (34626476).

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

22066720 is a wasteful number, since it uses less digits than its factorization.

22066720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 22066720 is about 4697.5227514084. The cubic root of 22066720 is about 280.4869078994.

The spelling of 22066720 in words is "twenty-two million, sixty-six thousand, seven hundred twenty".