20463654217 has 2 divisors, whose sum is σ = 20463654218. Its totient is φ = 20463654216.

The previous prime is 20463654193. The next prime is 20463654247. The reversal of 20463654217 is 71245636402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19823513616 + 640140601 = 140796^2 + 25301^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463654217 - 2⁷ = 20463654089 is a prime.

It is a super-2 number, since 2×20463654217² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20463654217.

It is not a weakly prime, because it can be changed into another prime (20463654247) 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, 10231827108 + 10231827109.

It is an arithmetic number, because the mean of its divisors is an integer number (10231827109).

Almost surely, 2^20463654217 is an apocalyptic number.

It is an amenable number.

20463654217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20463654217 is an equidigital number, since it uses as much as digits as its factorization.

20463654217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 20463654217 in words is "twenty billion, four hundred sixty-three million, six hundred fifty-four thousand, two hundred seventeen".