20012012009 has 12 divisors (see below), whose sum is σ = 23290598772. Its totient is φ = 17122575360.

The previous prime is 20012011997. The next prime is 20012012011. The reversal of 20012012009 is 90021021002.

It can be written as a sum of positive squares in 2 ways, for example, as 18761328784 + 1250683225 = 136972^2 + 35365^2 .

It is not a de Polignac number, because 20012012009 - 2⁸ = 20012011753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012012039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4862312 + ... + 4866425.

It is an arithmetic number, because the mean of its divisors is an integer number (1940883231).

Almost surely, 2^20012012009 is an apocalyptic number.

It is an amenable number.

20012012009 is a deficient number, since it is larger than the sum of its proper divisors (3278586763).

20012012009 is a wasteful number, since it uses less digits than its factorization.

20012012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728776 (or 9728765 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20012012009 in words is "twenty billion, twelve million, twelve thousand, nine".