20620515173 has 2 divisors, whose sum is σ = 20620515174. Its totient is φ = 20620515172.

The previous prime is 20620515107. The next prime is 20620515229. The reversal of 20620515173 is 37151502602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19393904644 + 1226610529 = 139262^2 + 35023^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620515173 - 2⁸ = 20620514917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620515973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310257586 + 10310257587.

It is an arithmetic number, because the mean of its divisors is an integer number (10310257587).

Almost surely, 2^20620515173 is an apocalyptic number.

It is an amenable number.

20620515173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620515173 is an equidigital number, since it uses as much as digits as its factorization.

20620515173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The spelling of 20620515173 in words is "twenty billion, six hundred twenty million, five hundred fifteen thousand, one hundred seventy-three".