9109191920020 has 24 divisors (see below), whose sum is σ = 19130005372968. Its totient is φ = 3643542988800.

The previous prime is 9109191919999. The next prime is 9109191920077. The reversal of 9109191920020 is 200291919019.

It can be written as a sum of positive squares in 4 ways, for example, as 2843722359556 + 6265469560464 = 1686334^2 + 2503092^2 .

It is a congruent number.

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, 7801941 + ... + 8893180.

It is an arithmetic number, because the mean of its divisors is an integer number (797083557207).

Almost surely, 2^{9109191920020} is an apocalyptic number.

It is an amenable number.

9109191920020 is an abundant number, since it is smaller than the sum of its proper divisors (10020813452948).

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

9109191920020 is a wasteful number, since it uses less digits than its factorization.

9109191920020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16722411 (or 16722409 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 9109191920020 in words is "nine trillion, one hundred nine billion, one hundred ninety-one million, nine hundred twenty thousand, twenty".