20345020016647 has 2 divisors, whose sum is σ = 20345020016648. Its totient is φ = 20345020016646.

The previous prime is 20345020016621. The next prime is 20345020016669. The reversal of 20345020016647 is 74661002054302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20345020016647 - 2¹⁹ = 20345019492359 is a prime.

It is a super-3 number, since 3×20345020016647³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345020016677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172510008323 + 10172510008324.

It is an arithmetic number, because the mean of its divisors is an integer number (10172510008324).

Almost surely, 2^{20345020016647} is an apocalyptic number.

20345020016647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345020016647 is an equidigital number, since it uses as much as digits as its factorization.

20345020016647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 20345020016647 in words is "twenty trillion, three hundred forty-five billion, twenty million, sixteen thousand, six hundred forty-seven".