20127754567705 has 4 divisors (see below), whose sum is σ = 24153305481252. Its totient is φ = 16102203654160.

The previous prime is 20127754567649. The next prime is 20127754567709. The reversal of 20127754567705 is 50776545772102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3198413904921 + 16929340662784 = 1788411^2 + 4114528^2 .

It is not a de Polignac number, because 20127754567705 - 2²⁹ = 20127217696793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20127754567705.

It is not an unprimeable number, because it can be changed into a prime (20127754567709) 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, 2012775456766 + ... + 2012775456775.

It is an arithmetic number, because the mean of its divisors is an integer number (6038326370313).

Almost surely, 2^{20127754567705} is an apocalyptic number.

It is an amenable number.

20127754567705 is a deficient number, since it is larger than the sum of its proper divisors (4025550913547).

20127754567705 is an equidigital number, since it uses as much as digits as its factorization.

20127754567705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025550913546.

The product of its (nonzero) digits is 28812000, while the sum is 58.

The spelling of 20127754567705 in words is "twenty trillion, one hundred twenty-seven billion, seven hundred fifty-four million, five hundred sixty-seven thousand, seven hundred five".