20203143666 has 16 divisors (see below), whose sum is σ = 40763866464. Its totient is φ = 6674784704.

The previous prime is 20203143661. The next prime is 20203143733. The reversal of 20203143666 is 66634130202.

It is not an unprimeable number, because it can be changed into a prime (20203143661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14898396 + ... + 14899751.

It is an arithmetic number, because the mean of its divisors is an integer number (2547741654).

Almost surely, 2^20203143666 is an apocalyptic number.

20203143666 is an abundant number, since it is smaller than the sum of its proper divisors (20560722798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20203143666 is a wasteful number, since it uses less digits than its factorization.

20203143666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29798265.

The product of its (nonzero) digits is 31104, while the sum is 33.

Adding to 20203143666 its reverse (66634130202), we get a palindrome (86837273868).

The spelling of 20203143666 in words is "twenty billion, two hundred three million, one hundred forty-three thousand, six hundred sixty-six".