20001100999972 has 12 divisors (see below), whose sum is σ = 35257415267340. Its totient is φ = 9927553780736.

The previous prime is 20001100999967. The next prime is 20001100999991. The reversal of 20001100999972 is 27999900110002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17516618901796 + 2484482098176 = 4185286^2 + 1576224^2 .

It is a super-2 number, since 2×20001100999972² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18249179197 + ... + 18249180292.

It is an arithmetic number, because the mean of its divisors is an integer number (2938117938945).

Almost surely, 2^{20001100999972} is an apocalyptic number.

It is an amenable number.

20001100999972 is a deficient number, since it is larger than the sum of its proper divisors (15256314267368).

20001100999972 is a wasteful number, since it uses less digits than its factorization.

20001100999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36498359630 (or 36498359628 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 49.

The spelling of 20001100999972 in words is "twenty trillion, one billion, one hundred million, nine hundred ninety-nine thousand, nine hundred seventy-two".