20439196417 has 2 divisors, whose sum is σ = 20439196418. Its totient is φ = 20439196416.

The previous prime is 20439196387. The next prime is 20439196511. The reversal of 20439196417 is 71469193402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18311773041 + 2127423376 = 135321^2 + 46124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20439196417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20439190417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219598208 + 10219598209.

It is an arithmetic number, because the mean of its divisors is an integer number (10219598209).

Almost surely, 2^20439196417 is an apocalyptic number.

It is an amenable number.

20439196417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439196417 is an equidigital number, since it uses as much as digits as its factorization.

20439196417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 20439196417 in words is "twenty billion, four hundred thirty-nine million, one hundred ninety-six thousand, four hundred seventeen".