20948589217 has 2 divisors, whose sum is σ = 20948589218. Its totient is φ = 20948589216.

The previous prime is 20948589191. The next prime is 20948589257. The reversal of 20948589217 is 71298584902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18186140736 + 2762448481 = 134856^2 + 52559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20948589217 - 2²³ = 20940200609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20948589257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474294608 + 10474294609.

It is an arithmetic number, because the mean of its divisors is an integer number (10474294609).

Almost surely, 2^20948589217 is an apocalyptic number.

It is an amenable number.

20948589217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948589217 is an equidigital number, since it uses as much as digits as its factorization.

20948589217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 20948589217 in words is "twenty billion, nine hundred forty-eight million, five hundred eighty-nine thousand, two hundred seventeen".