20566128 has 60 divisors (see below), whose sum is σ = 58414664. Its totient is φ = 6230400.

The previous prime is 20566123. The next prime is 20566129. The reversal of 20566128 is 82166502.

It is a junction number, because it is equal to n+sod(n) for n = 20566095 and 20566104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20566121) 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 11 ways as a sum of consecutive naturals, for example, 4038 + ... + 7578.

Almost surely, 2^20566128 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 20566128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29207332).

20566128 is an abundant number, since it is smaller than the sum of its proper divisors (37848536).

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

20566128 is a wasteful number, since it uses less digits than its factorization.

20566128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20566128 is about 4534.9893053898. The cubic root of 20566128 is about 273.9791484301.

The spelling of 20566128 in words is "twenty million, five hundred sixty-six thousand, one hundred twenty-eight".