20011112100 has 288 divisors, whose sum is σ = 75235184640. Its totient is φ = 4467415680.

The previous prime is 20011112089. The next prime is 20011112137. The reversal of 20011112100 is 121111002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 800389 + ... + 825011.

It is an arithmetic number, because the mean of its divisors is an integer number (261233280).

Almost surely, 2^20011112100 is an apocalyptic number.

20011112100 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 20011112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37617592320).

20011112100 is an abundant number, since it is smaller than the sum of its proper divisors (55224072540).

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

20011112100 is a wasteful number, since it uses less digits than its factorization.

20011112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696 (or 24683 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011112100 its reverse (121111002), we get a palindrome (20132223102).

The spelling of 20011112100 in words is "twenty billion, eleven million, one hundred twelve thousand, one hundred".