20663066 has 4 divisors (see below), whose sum is σ = 30994602. Its totient is φ = 10331532.

The previous prime is 20663053. The next prime is 20663087. The reversal of 20663066 is 66036602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 8265625 = 3521^2 + 2875^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5165765 + ... + 5165768.

Almost surely, 2^20663066 is an apocalyptic number.

20663066 is a deficient number, since it is larger than the sum of its proper divisors (10331536).

20663066 is a wasteful number, since it uses less digits than its factorization.

20663066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10331535.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 20663066 is about 4545.6645278771. The cubic root of 20663066 is about 274.4089387988.

Adding to 20663066 its reverse (66036602), we get a palindrome (86699668).

The spelling of 20663066 in words is "twenty million, six hundred sixty-three thousand, sixty-six".