20001020100100 has 36 divisors (see below), whose sum is σ = 46740845436964. Its totient is φ = 7384992036480.

The previous prime is 20001020100013. The next prime is 20001020100109. The reversal of 20001020100100 is 100102010002.

It can be written as a sum of positive squares in 6 ways, for example, as 1449020356 + 19999571079744 = 38066^2 + 4472088^2 .

It is not an unprimeable number, because it can be changed into a prime (20001020100109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7692698739 + ... + 7692701338.

Almost surely, 2^{20001020100100} is an apocalyptic number.

20001020100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001020100100 is an abundant number, since it is smaller than the sum of its proper divisors (26739825336864).

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

20001020100100 is a wasteful number, since it uses less digits than its factorization.

20001020100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15385400104 (or 15385400097 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20001020100100 its reverse (100102010002), we get a palindrome (20101122110102).

The spelling of 20001020100100 in words is "twenty trillion, one billion, twenty million, one hundred thousand, one hundred".