20001181911 has 8 divisors (see below), whose sum is σ = 26725843200. Its totient is φ = 13305320952.

The previous prime is 20001181873. The next prime is 20001181913. The reversal of 20001181911 is 11918110002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001181911 - 2³³ = 11411247319 is a prime.

It is a super-2 number, since 2×20001181911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001181913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7198461 + ... + 7201238.

It is an arithmetic number, because the mean of its divisors is an integer number (3340730400).

Almost surely, 2^20001181911 is an apocalyptic number.

20001181911 is a deficient number, since it is larger than the sum of its proper divisors (6724661289).

20001181911 is a wasteful number, since it uses less digits than its factorization.

20001181911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14400165.

The product of its (nonzero) digits is 144, while the sum is 24.

Adding to 20001181911 its reverse (11918110002), we get a palindrome (31919291913).

The spelling of 20001181911 in words is "twenty billion, one million, one hundred eighty-one thousand, nine hundred eleven".