20660066 has 24 divisors (see below), whose sum is σ = 38173356. Its totient is φ = 8332800.

The previous prime is 20660051. The next prime is 20660099. The reversal of 20660066 is 66006602.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 148225 = 4529^2 + 385^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4535 + ... + 7866.

Almost surely, 2^20660066 is an apocalyptic number.

20660066 is a deficient number, since it is larger than the sum of its proper divisors (17513290).

20660066 is a wasteful number, since it uses less digits than its factorization.

20660066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12434 (or 12427 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20660066 is about 4545.3345311429. The cubic root of 20660066 is about 274.3956579904.

Adding to 20660066 its reverse (66006602), we get a palindrome (86666668).

The spelling of 20660066 in words is "twenty million, six hundred sixty thousand, sixty-six".