20124750917 has 2 divisors, whose sum is σ = 20124750918. Its totient is φ = 20124750916.

The previous prime is 20124750857. The next prime is 20124750949. The reversal of 20124750917 is 71905742102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14864730241 + 5260020676 = 121921^2 + 72526^2 .

It is a cyclic number.

It is not a de Polignac number, because 20124750917 - 2⁶ = 20124750853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20124750617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062375458 + 10062375459.

It is an arithmetic number, because the mean of its divisors is an integer number (10062375459).

Almost surely, 2^20124750917 is an apocalyptic number.

It is an amenable number.

20124750917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124750917 is an equidigital number, since it uses as much as digits as its factorization.

20124750917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 20124750917 in words is "twenty billion, one hundred twenty-four million, seven hundred fifty thousand, nine hundred seventeen".