20109100100 has 36 divisors (see below), whose sum is σ = 45534002304. Its totient is φ = 7693915680.

The previous prime is 20109100087. The next prime is 20109100103. The reversal of 20109100100 is 100190102.

It is not an unprimeable number, because it can be changed into a prime (20109100103) 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 11 ways as a sum of consecutive naturals, for example, 4369244 + ... + 4373843.

Almost surely, 2^20109100100 is an apocalyptic number.

20109100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20109100100 is an abundant number, since it is smaller than the sum of its proper divisors (25424902204).

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

20109100100 is a wasteful number, since it uses less digits than its factorization.

20109100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8743124 (or 8743117 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 20109100100 its reverse (100190102), we get a palindrome (20209290202).

The spelling of 20109100100 in words is "twenty billion, one hundred nine million, one hundred thousand, one hundred".