20101989106808 has 64 divisors (see below), whose sum is σ = 43949485440000. Its totient is φ = 8440831481472.

The previous prime is 20101989106741. The next prime is 20101989106847. The reversal of 20101989106808 is 80860198910102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 20101989106808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2575958 + ... + 6843941.

It is an arithmetic number, because the mean of its divisors is an integer number (686710710000).

Almost surely, 2^{20101989106808} is an apocalyptic number.

20101989106808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20101989106808 is an abundant number, since it is smaller than the sum of its proper divisors (23847496333192).

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

20101989106808 is a wasteful number, since it uses less digits than its factorization.

20101989106808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420684 (or 9420680 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 53.

The spelling of 20101989106808 in words is "twenty trillion, one hundred one billion, nine hundred eighty-nine million, one hundred six thousand, eight hundred eight".