11201020020 has 72 divisors (see below), whose sum is σ = 33987287880.
Its totient is φ = 2985984000.
The previous prime is 11201020007. The next prime is 11201020043. The reversal of 11201020020 is 2002010211.
It can be written as a sum of positive squares in 4 ways, for example, as 3910251024 + 7290768996 = 62532^2 + 85386^2
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 11201019984 and 11201020011.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 692020 + ... + 708020.
It is an arithmetic number, because the mean of its divisors is an integer number (472045665).
Almost surely, 211201020020 is an apocalyptic number.
11201020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
11201020020 is an abundant number, since it is smaller than the sum of its proper divisors (22786267860).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
11201020020 is a wasteful number, since it uses less digits than its factorization.
11201020020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19905 (or 19900 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
Adding to 11201020020 its reverse (2002010211), we get a palindrome (13203030231).
The spelling of 11201020020 in words is "eleven billion, two hundred one million, twenty thousand, twenty".