200011021020 has 144 divisors (see below), whose sum is σ = 630844800768. Its totient is φ = 51238794240.

The previous prime is 200011021013. The next prime is 200011021031. The reversal of 200011021020 is 20120110002.

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 = 200011020993 and 200011021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 633642 + ... + 895278.

It is an arithmetic number, because the mean of its divisors is an integer number (4380866672).

Almost surely, 2^200011021020 is an apocalyptic number.

200011021020 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 200011021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315422400384).

200011021020 is an abundant number, since it is smaller than the sum of its proper divisors (430833779748).

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

200011021020 is a wasteful number, since it uses less digits than its factorization.

200011021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261820 (or 261815 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 200011021020 its reverse (20120110002), we get a palindrome (220131131022).

The spelling of 200011021020 in words is "two hundred billion, eleven million, twenty-one thousand, twenty".