20169389517 has 16 divisors (see below), whose sum is σ = 28098707328. Its totient is φ = 12844705280.

The previous prime is 20169389473. The next prime is 20169389521. The reversal of 20169389517 is 71598396102.

It is a cyclic number.

It is not a de Polignac number, because 20169389517 - 2⁷ = 20169389389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20169389517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169381517) 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 in 15 ways as a sum of consecutive naturals, for example, 139548 + ... + 244565.

It is an arithmetic number, because the mean of its divisors is an integer number (1756169208).

Almost surely, 2^20169389517 is an apocalyptic number.

It is an amenable number.

20169389517 is a deficient number, since it is larger than the sum of its proper divisors (7929317811).

20169389517 is a wasteful number, since it uses less digits than its factorization.

20169389517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384900.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 20169389517 in words is "twenty billion, one hundred sixty-nine million, three hundred eighty-nine thousand, five hundred seventeen".