22720784 has 20 divisors (see below), whose sum is σ = 44099484. Its totient is φ = 11340288.

The previous prime is 22720777. The next prime is 22720793. The reversal of 22720784 is 48702722.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14992384 + 7728400 = 3872^2 + 2780^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22720784.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12884 + ... + 14540.

Almost surely, 2^22720784 is an apocalyptic number.

It is an amenable number.

22720784 is a deficient number, since it is larger than the sum of its proper divisors (21378700).

22720784 is a wasteful number, since it uses less digits than its factorization.

22720784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522 (or 2516 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 22720784 is about 4766.6323541889. The cubic root of 22720784 is about 283.2312077922.

The spelling of 22720784 in words is "twenty-two million, seven hundred twenty thousand, seven hundred eighty-four".