20835491668439 has 16 divisors (see below), whose sum is σ = 25213031836416. Its totient is φ = 16808239843200.

The previous prime is 20835491668399. The next prime is 20835491668441. The reversal of 20835491668439 is 93486619453802.

It is a cyclic number.

It is not a de Polignac number, because 20835491668439 - 2²⁰ = 20835490619863 is a prime.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20835491668489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8107724 + ... + 10363694.

It is an arithmetic number, because the mean of its divisors is an integer number (1575814489776).

Almost surely, 2^{20835491668439} is an apocalyptic number.

20835491668439 is a deficient number, since it is larger than the sum of its proper divisors (4377540167977).

20835491668439 is a wasteful number, since it uses less digits than its factorization.

20835491668439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333606.

The product of its (nonzero) digits is 268738560, while the sum is 68.

The spelling of 20835491668439 in words is "twenty trillion, eight hundred thirty-five billion, four hundred ninety-one million, six hundred sixty-eight thousand, four hundred thirty-nine".