20423251314017 has 2 divisors, whose sum is σ = 20423251314018. Its totient is φ = 20423251314016.

The previous prime is 20423251313963. The next prime is 20423251314061. The reversal of 20423251314017 is 71041315232402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18302045491921 + 2121205822096 = 4278089^2 + 1456436^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423251314017 - 2³⁰ = 20422177572193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20423251317017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211625657008 + 10211625657009.

It is an arithmetic number, because the mean of its divisors is an integer number (10211625657009).

Almost surely, 2^{20423251314017} is an apocalyptic number.

It is an amenable number.

20423251314017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423251314017 is an equidigital number, since it uses as much as digits as its factorization.

20423251314017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 20423251314017 its reverse (71041315232402), we get a palindrome (91464566546419).

The spelling of 20423251314017 in words is "twenty trillion, four hundred twenty-three billion, two hundred fifty-one million, three hundred fourteen thousand, seventeen".