20001122111987 has 16 divisors (see below), whose sum is σ = 21982699580160. Its totient is φ = 18113446102752.

The previous prime is 20001122111963. The next prime is 20001122112029. The reversal of 20001122111987 is 78911122110002.

It is a cyclic number.

It is not a de Polignac number, because 20001122111987 - 2⁸ = 20001122111731 is a prime.

It is a super-2 number, since 2×20001122111987² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001122711987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13354508 + ... + 14776505.

It is an arithmetic number, because the mean of its divisors is an integer number (1373918723760).

Almost surely, 2^{20001122111987} is an apocalyptic number.

20001122111987 is a deficient number, since it is larger than the sum of its proper divisors (1981577468173).

20001122111987 is a wasteful number, since it uses less digits than its factorization.

20001122111987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28132682.

The product of its (nonzero) digits is 4032, while the sum is 35.

Adding to 20001122111987 its reverse (78911122110002), we get a palindrome (98912244221989).

The spelling of 20001122111987 in words is "twenty trillion, one billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred eighty-seven".