20336786917 has 2 divisors, whose sum is σ = 20336786918. Its totient is φ = 20336786916.

The previous prime is 20336786887. The next prime is 20336786923. The reversal of 20336786917 is 71968763302.

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., 17066548321 + 3270238596 = 130639^2 + 57186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20336786917 - 2¹¹ = 20336784869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20336786927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168393458 + 10168393459.

It is an arithmetic number, because the mean of its divisors is an integer number (10168393459).

Almost surely, 2^20336786917 is an apocalyptic number.

It is an amenable number.

20336786917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20336786917 is an equidigital number, since it uses as much as digits as its factorization.

20336786917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 20336786917 in words is "twenty billion, three hundred thirty-six million, seven hundred eighty-six thousand, nine hundred seventeen".