20001866 has 8 divisors (see below), whose sum is σ = 30232224. Its totient is φ = 9924460.

The previous prime is 20001853. The next prime is 20001899. The reversal of 20001866 is 66810002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37910 + ... + 38433.

It is an arithmetic number, because the mean of its divisors is an integer number (3779028).

Almost surely, 2^20001866 is an apocalyptic number.

20001866 is a deficient number, since it is larger than the sum of its proper divisors (10230358).

20001866 is a wasteful number, since it uses less digits than its factorization.

20001866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76476.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20001866 is about 4472.3445752759. The cubic root of 20001866 is about 271.4502032358.

Adding to 20001866 its reverse (66810002), we get a palindrome (86811868).

The spelling of 20001866 in words is "twenty million, one thousand, eight hundred sixty-six".