20109209511673 has 2 divisors, whose sum is σ = 20109209511674. Its totient is φ = 20109209511672.

The previous prime is 20109209511541. The next prime is 20109209511683. The reversal of 20109209511673 is 37611590290102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13503625873984 + 6605583637689 = 3674728^2 + 2570133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20109209511673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20109209511683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054604755836 + 10054604755837.

It is an arithmetic number, because the mean of its divisors is an integer number (10054604755837).

Almost surely, 2^{20109209511673} is an apocalyptic number.

It is an amenable number.

20109209511673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109209511673 is an equidigital number, since it uses as much as digits as its factorization.

20109209511673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 20109209511673 in words is "twenty trillion, one hundred nine billion, two hundred nine million, five hundred eleven thousand, six hundred seventy-three".