20010111100 has 72 divisors (see below), whose sum is σ = 49899563168. Its totient is φ = 6822662400.

The previous prime is 20010111091. The next prime is 20010111139. The reversal of 20010111100 is 111101002.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47734 + ... + 205666.

Almost surely, 2^20010111100 is an apocalyptic number.

20010111100 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 20010111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24949781584).

20010111100 is an abundant number, since it is smaller than the sum of its proper divisors (29889452068).

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

20010111100 is a wasteful number, since it uses less digits than its factorization.

20010111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158135 (or 158128 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 20010111100 its reverse (111101002), we get a palindrome (20121212102).

The spelling of 20010111100 in words is "twenty billion, ten million, one hundred eleven thousand, one hundred".