20344156715617 has 8 divisors (see below), whose sum is σ = 23791173302336. Its totient is φ = 17032317250032.

The previous prime is 20344156715599. The next prime is 20344156715627. The reversal of 20344156715617 is 71651765144302.

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

It is not a de Polignac number, because 20344156715617 - 2³⁹ = 19794400901729 is a prime.

It is a super-2 number, since 2×20344156715617² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344156715627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33794279958 + ... + 33794280559.

It is an arithmetic number, because the mean of its divisors is an integer number (2973896662792).

Almost surely, 2^{20344156715617} is an apocalyptic number.

It is an amenable number.

20344156715617 is a deficient number, since it is larger than the sum of its proper divisors (3447016586719).

20344156715617 is an equidigital number, since it uses as much as digits as its factorization.

20344156715617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67588560567.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 20344156715617 in words is "twenty trillion, three hundred forty-four billion, one hundred fifty-six million, seven hundred fifteen thousand, six hundred seventeen".