20043144509 has 2 divisors, whose sum is σ = 20043144510. Its totient is φ = 20043144508.

The previous prime is 20043144497. The next prime is 20043144547. The reversal of 20043144509 is 90544134002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18781332025 + 1261812484 = 137045^2 + 35522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043144509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20043144599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021572254 + 10021572255.

It is an arithmetic number, because the mean of its divisors is an integer number (10021572255).

Almost surely, 2^20043144509 is an apocalyptic number.

It is an amenable number.

20043144509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043144509 is an equidigital number, since it uses as much as digits as its factorization.

20043144509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 20043144509 in words is "twenty billion, forty-three million, one hundred forty-four thousand, five hundred nine".