22528720 has 20 divisors (see below), whose sum is σ = 52379460. Its totient is φ = 9011456.

The previous prime is 22528717. The next prime is 22528739. The reversal of 22528720 is 2782522.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 9511056 = 3608^2 + 3084^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 12.

It is a congruent number.

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, 140725 + ... + 140884.

It is an arithmetic number, because the mean of its divisors is an integer number (2618973).

Almost surely, 2^22528720 is an apocalyptic number.

22528720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22528720 is an abundant number, since it is smaller than the sum of its proper divisors (29850740).

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

22528720 is a wasteful number, since it uses less digits than its factorization.

22528720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281622 (or 281616 counting only the distinct ones).

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

The square root of 22528720 is about 4746.4428786197. The cubic root of 22528720 is about 282.4308756136.

The spelling of 22528720 in words is "twenty-two million, five hundred twenty-eight thousand, seven hundred twenty".