20662105117 has 2 divisors, whose sum is σ = 20662105118. Its totient is φ = 20662105116.

The previous prime is 20662105109. The next prime is 20662105147. The reversal of 20662105117 is 71150126602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18050997316 + 2611107801 = 134354^2 + 51099^2 .

It is a cyclic number.

It is not a de Polignac number, because 20662105117 - 2³ = 20662105109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20662105147) 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, 10331052558 + 10331052559.

It is an arithmetic number, because the mean of its divisors is an integer number (10331052559).

Almost surely, 2^20662105117 is an apocalyptic number.

It is an amenable number.

20662105117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662105117 is an equidigital number, since it uses as much as digits as its factorization.

20662105117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 20662105117 in words is "twenty billion, six hundred sixty-two million, one hundred five thousand, one hundred seventeen".