20655020015117 has 2 divisors, whose sum is σ = 20655020015118. Its totient is φ = 20655020015116.

The previous prime is 20655020015083. The next prime is 20655020015143. The reversal of 20655020015117 is 71151002055602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20600242485001 + 54777530116 = 4538749^2 + 234046^2 .

It is a cyclic number.

It is not a de Polignac number, because 20655020015117 - 2⁸ = 20655020014861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20655020015417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327510007558 + 10327510007559.

It is an arithmetic number, because the mean of its divisors is an integer number (10327510007559).

Almost surely, 2^{20655020015117} is an apocalyptic number.

It is an amenable number.

20655020015117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20655020015117 is an equidigital number, since it uses as much as digits as its factorization.

20655020015117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 20655020015117 in words is "twenty trillion, six hundred fifty-five billion, twenty million, fifteen thousand, one hundred seventeen".