20216768317 has 2 divisors, whose sum is σ = 20216768318. Its totient is φ = 20216768316.

The previous prime is 20216768309. The next prime is 20216768353. The reversal of 20216768317 is 71386761202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19744184196 + 472584121 = 140514^2 + 21739^2 .

It is a cyclic number.

It is not a de Polignac number, because 20216768317 - 2³ = 20216768309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20216768357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108384158 + 10108384159.

It is an arithmetic number, because the mean of its divisors is an integer number (10108384159).

Almost surely, 2^20216768317 is an apocalyptic number.

It is an amenable number.

20216768317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216768317 is an equidigital number, since it uses as much as digits as its factorization.

20216768317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 20216768317 in words is "twenty billion, two hundred sixteen million, seven hundred sixty-eight thousand, three hundred seventeen".