20011100009 has 4 divisors (see below), whose sum is σ = 20292946560. Its totient is φ = 19729253460.

The previous prime is 20011099981. The next prime is 20011100023. The reversal of 20011100009 is 90000111002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011100009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011099966 and 20011100002.

It is not an unprimeable number, because it can be changed into a prime (20011100509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140923169 + ... + 140923310.

It is an arithmetic number, because the mean of its divisors is an integer number (5073236640).

Almost surely, 2^20011100009 is an apocalyptic number.

It is an amenable number.

20011100009 is a deficient number, since it is larger than the sum of its proper divisors (281846551).

20011100009 is an equidigital number, since it uses as much as digits as its factorization.

20011100009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281846550.

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

The spelling of 20011100009 in words is "twenty billion, eleven million, one hundred thousand, nine".