20508860173 has 2 divisors, whose sum is σ = 20508860174. Its totient is φ = 20508860172.

The previous prime is 20508860101. The next prime is 20508860213. The reversal of 20508860173 is 37106880502.

It is an a-pointer prime, because the next prime (20508860213) can be obtained adding 20508860173 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18383834569 + 2125025604 = 135587^2 + 46098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20508860173 is a prime.

It is a super-2 number, since 2×20508860173² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20508860773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254430086 + 10254430087.

It is an arithmetic number, because the mean of its divisors is an integer number (10254430087).

Almost surely, 2^20508860173 is an apocalyptic number.

It is an amenable number.

20508860173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508860173 is an equidigital number, since it uses as much as digits as its factorization.

20508860173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 20508860173 in words is "twenty billion, five hundred eight million, eight hundred sixty thousand, one hundred seventy-three".