20019291090911 has 24 divisors (see below), whose sum is σ = 23670933664176. Its totient is φ = 16877077902720.

The previous prime is 20019291090881. The next prime is 20019291090979. The reversal of 20019291090911 is 11909019291002.

It is not a de Polignac number, because 20019291090911 - 2²⁶ = 20019223982047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019291096911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51867140 + ... + 52251686.

It is an arithmetic number, because the mean of its divisors is an integer number (986288902674).

Almost surely, 2^{20019291090911} is an apocalyptic number.

20019291090911 is a deficient number, since it is larger than the sum of its proper divisors (3651642573265).

20019291090911 is a wasteful number, since it uses less digits than its factorization.

20019291090911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402039 (or 402032 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 20019291090911 in words is "twenty trillion, nineteen billion, two hundred ninety-one million, ninety thousand, nine hundred eleven".