20145434417 has 2 divisors, whose sum is σ = 20145434418. Its totient is φ = 20145434416.

The previous prime is 20145434411. The next prime is 20145434471. The reversal of 20145434417 is 71443454102.

Together with next prime (20145434471) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19994242801 + 151191616 = 141401^2 + 12296^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145434417 - 2¹⁸ = 20145172273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20145434411) 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, 10072717208 + 10072717209.

It is an arithmetic number, because the mean of its divisors is an integer number (10072717209).

Almost surely, 2^20145434417 is an apocalyptic number.

It is an amenable number.

20145434417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145434417 is an equidigital number, since it uses as much as digits as its factorization.

20145434417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 35.

Adding to 20145434417 its reverse (71443454102), we get a palindrome (91588888519).

The spelling of 20145434417 in words is "twenty billion, one hundred forty-five million, four hundred thirty-four thousand, four hundred seventeen".