20011020111111 has 16 divisors (see below), whose sum is σ = 27844143676416. Its totient is φ = 12759401826336.

The previous prime is 20011020111109. The next prime is 20011020111167. The reversal of 20011020111111 is 11111102011002.

It is not a de Polignac number, because 20011020111111 - 2¹ = 20011020111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011020111011) 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, 13479040 + ... + 14889813.

It is an arithmetic number, because the mean of its divisors is an integer number (1740258979776).

Almost surely, 2^{20011020111111} is an apocalyptic number.

20011020111111 is a deficient number, since it is larger than the sum of its proper divisors (7833123565305).

20011020111111 is a wasteful number, since it uses less digits than its factorization.

20011020111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28379102.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20011020111111 its reverse (11111102011002), we get a palindrome (31122122122113).

The spelling of 20011020111111 in words is "twenty trillion, eleven billion, twenty million, one hundred eleven thousand, one hundred eleven".