22170720 has 384 divisors, whose sum is σ = 91445760. Its totient is φ = 4423680.

The previous prime is 22170719. The next prime is 22170727. The reversal of 22170720 is 2707122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22170727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1166871 + ... + 1166889.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

Almost surely, 2^22170720 is an apocalyptic number.

22170720 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 22170720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45722880).

22170720 is an abundant number, since it is smaller than the sum of its proper divisors (69275040).

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

22170720 is a wasteful number, since it uses less digits than its factorization.

22170720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 22170720 is about 4708.5794035993. The cubic root of 22170720 is about 280.9268604790.

Adding to 22170720 its reverse (2707122), we get a palindrome (24877842).

The spelling of 22170720 in words is "twenty-two million, one hundred seventy thousand, seven hundred twenty".