20001000100 has 72 divisors (see below), whose sum is σ = 45593956800. Its totient is φ = 7601066880.

The previous prime is 20001000083. The next prime is 20001000109. The reversal of 20001000100 is 100010002.

It is a Harshad number since it is a multiple of its sum of digits (4).

20001000100 is a modest number, since divided by 1000100 gives 200 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 20001000100.

It is not an unprimeable number, because it can be changed into a prime (20001000109) by changing a digit.

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, 313519 + ... + 371881.

It is an arithmetic number, because the mean of its divisors is an integer number (633249400).

Almost surely, 2^20001000100 is an apocalyptic number.

20001000100 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 20001000100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22796978400).

20001000100 is an abundant number, since it is smaller than the sum of its proper divisors (25592956700).

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

20001000100 is a wasteful number, since it uses less digits than its factorization.

20001000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58549 (or 58542 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

Adding to 20001000100 its reverse (100010002), we get a palindrome (20101010102).

The spelling of 20001000100 in words is "twenty billion, one million, one hundred", and thus it is an aban number.