20560386 has 64 divisors (see below), whose sum is σ = 51757056. Its totient is φ = 5289600.

The previous prime is 20560381. The next prime is 20560387. The reversal of 20560386 is 68306502.

It is not an unprimeable number, because it can be changed into a prime (20560381) 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 31 ways as a sum of consecutive naturals, for example, 88126 + ... + 88358.

It is an arithmetic number, because the mean of its divisors is an integer number (808704).

Almost surely, 2^20560386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20560386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25878528).

20560386 is an abundant number, since it is smaller than the sum of its proper divisors (31196670).

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

20560386 is a wasteful number, since it uses less digits than its factorization.

20560386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20560386 is about 4534.3561836274. The cubic root of 20560386 is about 273.9536480101.

Adding to 20560386 its reverse (68306502), we get a palindrome (88866888).

The spelling of 20560386 in words is "twenty million, five hundred sixty thousand, three hundred eighty-six".