20705167009 has 2 divisors, whose sum is σ = 20705167010. Its totient is φ = 20705167008.

The previous prime is 20705166971. The next prime is 20705167031. The reversal of 20705167009 is 90076150702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10821824784 + 9883342225 = 104028^2 + 99415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20705167009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705167039) 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 as a sum of consecutive naturals, namely, 10352583504 + 10352583505.

It is an arithmetic number, because the mean of its divisors is an integer number (10352583505).

Almost surely, 2^20705167009 is an apocalyptic number.

It is an amenable number.

20705167009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705167009 is an equidigital number, since it uses as much as digits as its factorization.

20705167009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The spelling of 20705167009 in words is "twenty billion, seven hundred five million, one hundred sixty-seven thousand, nine".