20001100100 has 36 divisors (see below), whose sum is σ = 45955472724. Its totient is φ = 7529825280.

The previous prime is 20001100073. The next prime is 20001100111. The reversal of 20001100100 is 100110002.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 333281536 + 19667818564 = 18256^2 + 140242^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5880977 + ... + 5884376.

It is an arithmetic number, because the mean of its divisors is an integer number (1276540909).

Almost surely, 2^20001100100 is an apocalyptic number.

20001100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001100100 is an abundant number, since it is smaller than the sum of its proper divisors (25954372624).

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

20001100100 is a wasteful number, since it uses less digits than its factorization.

20001100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11765384 (or 11765377 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 20001100100 its reverse (100110002), we get a palindrome (20101210102).

The spelling of 20001100100 in words is "twenty billion, one million, one hundred thousand, one hundred".