201100000020 has 48 divisors (see below), whose sum is σ = 564914188608. Its totient is φ = 53451982080.

The previous prime is 201100000001. The next prime is 201100000027. The reversal of 201100000020 is 20000001102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 201099999954 and 201100000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201100000027) 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, 5440321 + ... + 5477160.

It is an arithmetic number, because the mean of its divisors is an integer number (11769045596).

Almost surely, 2^201100000020 is an apocalyptic number.

201100000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201100000020 is an abundant number, since it is smaller than the sum of its proper divisors (363814188588).

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

201100000020 is a wasteful number, since it uses less digits than its factorization.

201100000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917800 (or 10917798 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 201100000020 its reverse (20000001102), we get a palindrome (221100001122).

The spelling of 201100000020 in words is "two hundred one billion, one hundred million, twenty", and thus it is an aban number.