22720816 has 20 divisors (see below), whose sum is σ = 44193600. Its totient is φ = 11316032.

The previous prime is 22720811. The next prime is 22720829. The reversal of 22720816 is 61802722.

It is not an unprimeable number, because it can be changed into a prime (22720811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (2209680).

Almost surely, 2^22720816 is an apocalyptic number.

It is an amenable number.

22720816 is a deficient number, since it is larger than the sum of its proper divisors (21472784).

22720816 is a wasteful number, since it uses less digits than its factorization.

22720816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556 (or 5550 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 22720816 is about 4766.6357108552. The cubic root of 22720816 is about 283.2313407600.

The spelling of 22720816 in words is "twenty-two million, seven hundred twenty thousand, eight hundred sixteen".