20520106973 has 2 divisors, whose sum is σ = 20520106974. Its totient is φ = 20520106972.

The previous prime is 20520106889. The next prime is 20520106979. The reversal of 20520106973 is 37960102502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20265800164 + 254306809 = 142358^2 + 15947^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520106973 - 2²⁰ = 20519058397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20520106979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260053486 + 10260053487.

It is an arithmetic number, because the mean of its divisors is an integer number (10260053487).

Almost surely, 2^20520106973 is an apocalyptic number.

It is an amenable number.

20520106973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520106973 is an equidigital number, since it uses as much as digits as its factorization.

20520106973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 20520106973 in words is "twenty billion, five hundred twenty million, one hundred six thousand, nine hundred seventy-three".