20775400345617 has 4 divisors (see below), whose sum is σ = 27700533794160. Its totient is φ = 13850266897076.

The previous prime is 20775400345571. The next prime is 20775400345781. The reversal of 20775400345617 is 71654300457702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20775400345617 - 2¹⁰ = 20775400344593 is a prime.

It is a super-2 number, since 2×20775400345617² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20775400345617.

It is not an unprimeable number, because it can be changed into a prime (20775400345517) 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 3 ways as a sum of consecutive naturals, for example, 3462566724267 + ... + 3462566724272.

It is an arithmetic number, because the mean of its divisors is an integer number (6925133448540).

Almost surely, 2^{20775400345617} is an apocalyptic number.

It is an amenable number.

20775400345617 is a deficient number, since it is larger than the sum of its proper divisors (6925133448543).

20775400345617 is an equidigital number, since it uses as much as digits as its factorization.

20775400345617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925133448542.

The product of its (nonzero) digits is 4939200, while the sum is 51.

The spelling of 20775400345617 in words is "twenty trillion, seven hundred seventy-five billion, four hundred million, three hundred forty-five thousand, six hundred seventeen".