20000001111111 has 16 divisors (see below), whose sum is σ = 33862435744000. Its totient is φ = 11428572063384.

The previous prime is 20000001111071. The next prime is 20000001111121. The reversal of 20000001111111 is 11111110000002.

It is not a de Polignac number, because 20000001111111 - 2⁹ = 20000001110599 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 = 20000001111093 and 20000001111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000001111121) 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, 52910055661 + ... + 52910056038.

It is an arithmetic number, because the mean of its divisors is an integer number (2116402234000).

Almost surely, 2^{20000001111111} is an apocalyptic number.

20000001111111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20000001111111 is a deficient number, since it is larger than the sum of its proper divisors (13862434632889).

20000001111111 is a wasteful number, since it uses less digits than its factorization.

20000001111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105820111715 (or 105820111709 counting only the distinct ones).

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

Adding to 20000001111111 its reverse (11111110000002), we get a palindrome (31111111111113).

The spelling of 20000001111111 in words is "twenty trillion, one million, one hundred eleven thousand, one hundred eleven".