20385371886891 has 32 divisors (see below), whose sum is σ = 30458978188800. Its totient is φ = 12018435367680.

The previous prime is 20385371886889. The next prime is 20385371886911. The reversal of 20385371886891 is 19868817358302.

It is not a de Polignac number, because 20385371886891 - 2¹ = 20385371886889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20385371886851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4387170 + ... + 7747128.

It is an arithmetic number, because the mean of its divisors is an integer number (951843068400).

Almost surely, 2^{20385371886891} is an apocalyptic number.

20385371886891 is a deficient number, since it is larger than the sum of its proper divisors (10073606301909).

20385371886891 is a wasteful number, since it uses less digits than its factorization.

20385371886891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364979.

The product of its (nonzero) digits is 139345920, while the sum is 69.

The spelling of 20385371886891 in words is "twenty trillion, three hundred eighty-five billion, three hundred seventy-one million, eight hundred eighty-six thousand, eight hundred ninety-one".