20001091099 has 4 divisors (see below), whose sum is σ = 21819372120. Its totient is φ = 18182810080.

The previous prime is 20001091093. The next prime is 20001091109. The reversal of 20001091099 is 99019010002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001091099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001091099.

It is not an unprimeable number, because it can be changed into a prime (20001091093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909140494 + ... + 909140515.

It is an arithmetic number, because the mean of its divisors is an integer number (5454843030).

Almost surely, 2^20001091099 is an apocalyptic number.

20001091099 is a deficient number, since it is larger than the sum of its proper divisors (1818281021).

20001091099 is a wasteful number, since it uses less digits than its factorization.

20001091099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818281020.

The product of its (nonzero) digits is 1458, while the sum is 31.

The spelling of 20001091099 in words is "twenty billion, one million, ninety-one thousand, ninety-nine".