20000666 has 16 divisors (see below), whose sum is σ = 34347456. Its totient is φ = 8556576.

The previous prime is 20000641. The next prime is 20000671. The reversal of 20000666 is 66600002.

20000666 is a modest number, since divided by 666 gives 20 as remainder.

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, 11165 + ... + 12831.

It is an arithmetic number, because the mean of its divisors is an integer number (2146716).

Almost surely, 2^20000666 is an apocalyptic number.

20000666 is a deficient number, since it is larger than the sum of its proper divisors (14346790).

20000666 is a wasteful number, since it uses less digits than its factorization.

20000666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20000666 is about 4472.2104154434. The cubic root of 20000666 is about 271.4447746296. Note that the first 3 decimals are identical.

Adding to 20000666 its reverse (66600002), we get a palindrome (86600668).

The spelling of 20000666 in words is "twenty million, six hundred sixty-six", and thus it is an aban number.