20659890889509 has 8 divisors (see below), whose sum is σ = 27591167089920. Its totient is φ = 13750937641056.

The previous prime is 20659890889501. The next prime is 20659890889523. The reversal of 20659890889509 is 90598809895602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20659890889509 - 2³ = 20659890889501 is a prime.

It is a super-2 number, since 2×20659890889509² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20659890889501) 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 in 7 ways as a sum of consecutive naturals, for example, 5580735829 + ... + 5580739530.

It is an arithmetic number, because the mean of its divisors is an integer number (3448895886240).

Almost surely, 2^{20659890889509} is an apocalyptic number.

It is an amenable number.

20659890889509 is a deficient number, since it is larger than the sum of its proper divisors (6931276200411).

20659890889509 is a wasteful number, since it uses less digits than its factorization.

20659890889509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11161475979.

The product of its (nonzero) digits is 1007769600, while the sum is 78.

The spelling of 20659890889509 in words is "twenty trillion, six hundred fifty-nine billion, eight hundred ninety million, eight hundred eighty-nine thousand, five hundred nine".