20110091100 has 216 divisors, whose sum is σ = 64840277040. Its totient is φ = 4807756800.

The previous prime is 20110091051. The next prime is 20110091117. The reversal of 20110091100 is 119001102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20110091100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2646106 + ... + 2653694.

Almost surely, 2^20110091100 is an apocalyptic number.

20110091100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20110091100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32420138520).

20110091100 is an abundant number, since it is smaller than the sum of its proper divisors (44730185940).

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

20110091100 is a wasteful number, since it uses less digits than its factorization.

20110091100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7701 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 20110091100 its reverse (119001102), we get a palindrome (20229092202).

The spelling of 20110091100 in words is "twenty billion, one hundred ten million, ninety-one thousand, one hundred".