20501047117 has 2 divisors, whose sum is σ = 20501047118. Its totient is φ = 20501047116.

The previous prime is 20501047043. The next prime is 20501047121. The reversal of 20501047117 is 71174010502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19103109796 + 1397937321 = 138214^2 + 37389^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501047117 - 2⁷ = 20501046989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20501047187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250523558 + 10250523559.

It is an arithmetic number, because the mean of its divisors is an integer number (10250523559).

Almost surely, 2^20501047117 is an apocalyptic number.

It is an amenable number.

20501047117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501047117 is an equidigital number, since it uses as much as digits as its factorization.

20501047117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 28.

Adding to 20501047117 its reverse (71174010502), we get a palindrome (91675057619).

The spelling of 20501047117 in words is "twenty billion, five hundred one million, forty-seven thousand, one hundred seventeen".