20104543232009 has 2 divisors, whose sum is σ = 20104543232010. Its totient is φ = 20104543232008.

The previous prime is 20104543232003. The next prime is 20104543232071. The reversal of 20104543232009 is 90023234540102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19805303599225 + 299239632784 = 4450315^2 + 547028^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104543232009 - 2¹² = 20104543227913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20104543232009.

It is not a weakly prime, because it can be changed into another prime (20104543232003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052271616004 + 10052271616005.

It is an arithmetic number, because the mean of its divisors is an integer number (10052271616005).

Almost surely, 2^{20104543232009} is an apocalyptic number.

It is an amenable number.

20104543232009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104543232009 is an equidigital number, since it uses as much as digits as its factorization.

20104543232009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 20104543232009 in words is "twenty trillion, one hundred four billion, five hundred forty-three million, two hundred thirty-two thousand, nine".