20011002100 has 36 divisors (see below), whose sum is σ = 44035494048. Its totient is φ = 7891660000.

The previous prime is 20011002097. The next prime is 20011002101. The reversal of 20011002100 is 120011002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011002101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1402126 + ... + 1416325.

It is an arithmetic number, because the mean of its divisors is an integer number (1223208168).

Almost surely, 2^20011002100 is an apocalyptic number.

20011002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011002100 is an abundant number, since it is smaller than the sum of its proper divisors (24024491948).

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

20011002100 is a wasteful number, since it uses less digits than its factorization.

20011002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818536 (or 2818529 counting only the distinct ones).

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

Adding to 20011002100 its reverse (120011002), we get a palindrome (20131013102).

The spelling of 20011002100 in words is "twenty billion, eleven million, two thousand, one hundred".