20660559 has 16 divisors (see below), whose sum is σ = 29390688. Its totient is φ = 12864512.

The previous prime is 20660527. The next prime is 20660567. The reversal of 20660559 is 95506602.

It is not a de Polignac number, because 20660559 - 2⁵ = 20660527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660579) 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 15 ways as a sum of consecutive naturals, for example, 5509 + ... + 8465.

It is an arithmetic number, because the mean of its divisors is an integer number (1836918).

Almost surely, 2^20660559 is an apocalyptic number.

20660559 is a deficient number, since it is larger than the sum of its proper divisors (8730129).

20660559 is a wasteful number, since it uses less digits than its factorization.

20660559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 20660559 is about 4545.3887622513. The cubic root of 20660559 is about 274.3978405582.

The spelling of 20660559 in words is "twenty million, six hundred sixty thousand, five hundred fifty-nine".