22720528 has 20 divisors (see below), whose sum is σ = 44138668. Its totient is φ = 11329920.

The previous prime is 22720507. The next prime is 22720531. The reversal of 22720528 is 82502722.

It can be written as a sum of positive squares in 2 ways, for example, as 10969344 + 11751184 = 3312^2 + 3428^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22720496 and 22720505.

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, 5050 + ... + 8422.

Almost surely, 2^22720528 is an apocalyptic number.

It is an amenable number.

22720528 is a deficient number, since it is larger than the sum of its proper divisors (21418140).

22720528 is a wasteful number, since it uses less digits than its factorization.

22720528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802 (or 3796 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 22720528 is about 4766.6055007731. The cubic root of 22720528 is about 283.2301440457.

The spelling of 22720528 in words is "twenty-two million, seven hundred twenty thousand, five hundred twenty-eight".