20001111111111 has 16 divisors (see below), whose sum is σ = 28786178856960. Its totient is φ = 12279818340960.

The previous prime is 20001111111103. The next prime is 20001111111119. The reversal of 20001111111111 is 11111111110002.

It is an interprime number because it is at equal distance from previous prime (20001111111103) and next prime (20001111111119).

It is not a de Polignac number, because 20001111111111 - 2³ = 20001111111103 is a prime.

20001111111111 is a modest number, since divided by 11111111 gives 200011 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001111111119) 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, 594935631 + ... + 594969248.

It is an arithmetic number, because the mean of its divisors is an integer number (1799136178560).

Almost surely, 2^{20001111111111} is an apocalyptic number.

20001111111111 is a deficient number, since it is larger than the sum of its proper divisors (8785067745849).

20001111111111 is a wasteful number, since it uses less digits than its factorization.

20001111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189905326.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 20001111111111 its reverse (11111111110002), we get a palindrome (31112222221113).

The spelling of 20001111111111 in words is "twenty trillion, one billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".