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20000100000 = 25355163409

20000100000 has 288 divisors, whose sum is σ = 66185138880. Its totient is φ = 5287680000.

The previous prime is 20000099969. The next prime is 20000100013. The reversal of 20000100000 is 100002.

Adding to 20000100000 its reverse (100002), we get a palindrome (20000200002).

20000100000 is a nontrivial binomial coefficient, being equal to C(200001, 2).

It is a Harshad number since it is a multiple of its sum of digits (3).

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

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 47 ways as a sum of consecutive naturals, for example, 48899796 + ... + 48900204.

It is an arithmetic number, because the mean of its divisors is an integer number (229809510).

Almost surely, 220000100000 is an apocalyptic number.

20000100000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20000100000 is the 200000-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33092569440).

20000100000 is an abundant number, since it is smaller than the sum of its proper divisors (46185038880).

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

20000100000 is an equidigital number, since it uses as much as digits as its factorization.

20000100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 3.

The spelling of 20000100000 in words is "twenty billion, one hundred thousand".