20556528 has 40 divisors (see below), whose sum is σ = 53605200. Its totient is φ = 6787584.

The previous prime is 20556521. The next prime is 20556533. The reversal of 20556528 is 82565502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556521) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3268 + ... + 7196.

It is an arithmetic number, because the mean of its divisors is an integer number (1340130).

Almost surely, 2^20556528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20556528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26802600).

20556528 is an abundant number, since it is smaller than the sum of its proper divisors (33048672).

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

20556528 is a wasteful number, since it uses less digits than its factorization.

20556528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049 (or 4043 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 20556528 is about 4533.9307449497. The cubic root of 20556528 is about 273.9365118324.

The spelling of 20556528 in words is "twenty million, five hundred fifty-six thousand, five hundred twenty-eight".