20434421417 has 2 divisors, whose sum is σ = 20434421418. Its totient is φ = 20434421416.

The previous prime is 20434421269. The next prime is 20434421431. The reversal of 20434421417 is 71412443402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19805214361 + 629207056 = 140731^2 + 25084^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434421417 - 2²⁴ = 20417644201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20434421437) 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, 10217210708 + 10217210709.

It is an arithmetic number, because the mean of its divisors is an integer number (10217210709).

Almost surely, 2^20434421417 is an apocalyptic number.

It is an amenable number.

20434421417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434421417 is an equidigital number, since it uses as much as digits as its factorization.

20434421417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

Adding to 20434421417 its reverse (71412443402), we get a palindrome (91846864819).

The spelling of 20434421417 in words is "twenty billion, four hundred thirty-four million, four hundred twenty-one thousand, four hundred seventeen".