20011110111 has 12 divisors (see below), whose sum is σ = 29837354560. Its totient is φ = 12910393440.

The previous prime is 20011110109. The next prime is 20011110113. The reversal of 20011110111 is 11101111002.

It is an interprime number because it is at equal distance from previous prime (20011110109) and next prime (20011110113).

It is not a de Polignac number, because 20011110111 - 2¹ = 20011110109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011110093 and 20011110102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011110113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35861926 + ... + 35862483.

Almost surely, 2^20011110111 is an apocalyptic number.

20011110111 is a deficient number, since it is larger than the sum of its proper divisors (9826244449).

20011110111 is a wasteful number, since it uses less digits than its factorization.

20011110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71724446 (or 71724443 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 20011110111 its reverse (11101111002), we get a palindrome (31112221113).

The spelling of 20011110111 in words is "twenty billion, eleven million, one hundred ten thousand, one hundred eleven".