20133243209 has 2 divisors, whose sum is σ = 20133243210. Its totient is φ = 20133243208.

The previous prime is 20133243199. The next prime is 20133243211. The reversal of 20133243209 is 90234233102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11093987584 + 9039255625 = 105328^2 + 95075^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133243209 - 2²⁰ = 20132194633 is a prime.

It is a super-2 number, since 2×20133243209² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20133243211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20133263209) 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 as a sum of consecutive naturals, namely, 10066621604 + 10066621605.

It is an arithmetic number, because the mean of its divisors is an integer number (10066621605).

Almost surely, 2^20133243209 is an apocalyptic number.

It is an amenable number.

20133243209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133243209 is an equidigital number, since it uses as much as digits as its factorization.

20133243209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The spelling of 20133243209 in words is "twenty billion, one hundred thirty-three million, two hundred forty-three thousand, two hundred nine".