20347390417 has 2 divisors, whose sum is σ = 20347390418. Its totient is φ = 20347390416.

The previous prime is 20347390403. The next prime is 20347390439. The reversal of 20347390417 is 71409374302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18620239936 + 1727150481 = 136456^2 + 41559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20347390417 - 2²⁷ = 20213172689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20347390417.

It is not a weakly prime, because it can be changed into another prime (20347390487) 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, 10173695208 + 10173695209.

It is an arithmetic number, because the mean of its divisors is an integer number (10173695209).

Almost surely, 2^20347390417 is an apocalyptic number.

It is an amenable number.

20347390417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347390417 is an equidigital number, since it uses as much as digits as its factorization.

20347390417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 20347390417 in words is "twenty billion, three hundred forty-seven million, three hundred ninety thousand, four hundred seventeen".