20011111111100 has 36 divisors (see below), whose sum is σ = 43424333560608. Its totient is φ = 8004403440000.

The previous prime is 20011111111039. The next prime is 20011111111213. The reversal of 20011111111100 is 111111111002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25853720 + ... + 26616480.

Almost surely, 2^{20011111111100} is an apocalyptic number.

20011111111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011111111100 is an abundant number, since it is smaller than the sum of its proper divisors (23413222449508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20011111111100 is a wasteful number, since it uses less digits than its factorization.

20011111111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025126 (or 1025119 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 20011111111100 its reverse (111111111002), we get a palindrome (20122222222102).

It can be divided in two parts, 20011 and 111111100, that added together give a palindrome (111131111).

The spelling of 20011111111100 in words is "twenty trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred".