20662066 has 16 divisors (see below), whose sum is σ = 31677624. Its totient is φ = 10105344.

The previous prime is 20662051. The next prime is 20662079. The reversal of 20662066 is 66026602.

It can be written as a sum of positive squares in 4 ways, for example, as 20657025 + 5041 = 4545^2 + 71^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 19486 + ... + 20518.

Almost surely, 2^20662066 is an apocalyptic number.

20662066 is a deficient number, since it is larger than the sum of its proper divisors (11015558).

20662066 is a wasteful number, since it uses less digits than its factorization.

20662066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20662066 is about 4545.5545316276. The cubic root of 20662066 is about 274.4045120055.

Adding to 20662066 its reverse (66026602), we get a palindrome (86688668).

The spelling of 20662066 in words is "twenty million, six hundred sixty-two thousand, sixty-six".