22720000 has 100 divisors (see below), whose sum is σ = 57525336. Its totient is φ = 8960000.

The previous prime is 22719997. The next prime is 22720001. The reversal of 22720000 is 2722.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 319965 + ... + 320035.

Almost surely, 2^22720000 is an apocalyptic number.

22720000 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 22720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28762668).

22720000 is an abundant number, since it is smaller than the sum of its proper divisors (34805336).

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

22720000 is an frugal number, since it uses more digits than its factorization.

22720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 13.

The square root of 22720000 is about 4766.5501151252. The cubic root of 22720000 is about 283.2279500434.

Adding to 22720000 its reverse (2722), we get a palindrome (22722722).

The spelling of 22720000 in words is "twenty-two million, seven hundred twenty thousand".