20202018666 has 16 divisors (see below), whose sum is σ = 40407053664.
Its totient is φ = 6733503504.
The previous prime is 20202018649. The next prime is 20202018701. The reversal of 20202018666 is 66681020202.
Adding to 20202018666 its reverse (66681020202), we get a palindrome (86883038868).
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33400 + ... + 203763.
It is an arithmetic number, because the mean of its divisors is an integer number (2525440854).
Almost surely, 220202018666 is an apocalyptic number.
20202018666 is an abundant number, since it is smaller than the sum of its proper divisors (20205034998).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20202018666 is a wasteful number, since it uses less digits than its factorization.
20202018666 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 251365.
The product of its (nonzero) digits is 13824, while the sum is 33.
The spelling of 20202018666 in words is "twenty billion, two hundred two million, eighteen thousand, six hundred sixty-six".