22720328 has 8 divisors (see below), whose sum is σ = 42600630. Its totient is φ = 11360160.

The previous prime is 22720319. The next prime is 22720349. The reversal of 22720328 is 82302722.

It can be written as a sum of positive squares in only one way, i.e., 22108804 + 611524 = 4702^2 + 782^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 22720297 and 22720306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1420013 + ... + 1420028.

Almost surely, 2^22720328 is an apocalyptic number.

It is an amenable number.

22720328 is a deficient number, since it is larger than the sum of its proper divisors (19880302).

22720328 is a wasteful number, since it uses less digits than its factorization.

22720328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840047 (or 2840043 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 22720328 is about 4766.5845214367. The cubic root of 22720328 is about 283.2293129882.

The spelling of 22720328 in words is "twenty-two million, seven hundred twenty thousand, three hundred twenty-eight".