20001000009 has 32 divisors (see below), whose sum is σ = 28314316800. Its totient is φ = 12523464000.

The previous prime is 20001000001. The next prime is 20001000013. The reversal of 20001000009 is 90000010002.

It is a happy number.

It is not a de Polignac number, because 20001000009 - 2³ = 20001000001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20000999958 and 20001000003.

It is not an unprimeable number, because it can be changed into a prime (20001000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3187327 + ... + 3193595.

It is an arithmetic number, because the mean of its divisors is an integer number (884822400).

Almost surely, 2^20001000009 is an apocalyptic number.

It is an amenable number.

20001000009 is a deficient number, since it is larger than the sum of its proper divisors (8313316791).

20001000009 is a wasteful number, since it uses less digits than its factorization.

20001000009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6765.

The product of its (nonzero) digits is 18, while the sum is 12.

The spelling of 20001000009 in words is "twenty billion, one million, nine", and thus it is an aban number and an uban number.