20660056 has 16 divisors (see below), whose sum is σ = 38829240. Its totient is φ = 10305600.

The previous prime is 20660051. The next prime is 20660099. The reversal of 20660056 is 65006602.

It is a self number, because there is not a number n which added to its sum of digits gives 20660056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831 + ... + 6481.

Almost surely, 2^20660056 is an apocalyptic number.

It is an amenable number.

20660056 is a deficient number, since it is larger than the sum of its proper divisors (18169184).

20660056 is a wasteful number, since it uses less digits than its factorization.

20660056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114 (or 6110 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20660056 is about 4545.3334311137. Note that the first 3 decimals coincide. The cubic root of 20660056 is about 274.3956137189.

Adding to 20660056 its reverse (65006602), we get a palindrome (85666658).

The spelling of 20660056 in words is "twenty million, six hundred sixty thousand, fifty-six".