20620341617 has 2 divisors, whose sum is σ = 20620341618. Its totient is φ = 20620341616.

The previous prime is 20620341589. The next prime is 20620341619. The reversal of 20620341617 is 71614302602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20075772721 + 544568896 = 141689^2 + 23336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620341617 - 2³⁴ = 3440472433 is a prime.

It is a super-5 number, since 5×20620341617⁵ (a number of 53 digits) contains 55555 as substring.

Together with 20620341619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20620341619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310170808 + 10310170809.

It is an arithmetic number, because the mean of its divisors is an integer number (10310170809).

Almost surely, 2^20620341617 is an apocalyptic number.

It is an amenable number.

20620341617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620341617 is an equidigital number, since it uses as much as digits as its factorization.

20620341617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 20620341617 in words is "twenty billion, six hundred twenty million, three hundred forty-one thousand, six hundred seventeen".