20568127747 has 4 divisors (see below), whose sum is σ = 20580164640. Its totient is φ = 20556090856.

The previous prime is 20568127711. The next prime is 20568127771. The reversal of 20568127747 is 74772186502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20568127747 is a prime.

It is a super-2 number, since 2×20568127747² (a number of 21 digits) contains 22 as substring.

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 20568127747.

It is not an unprimeable number, because it can be changed into a prime (20568127777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6015883 + ... + 6019300.

It is an arithmetic number, because the mean of its divisors is an integer number (5145041160).

Almost surely, 2^20568127747 is an apocalyptic number.

20568127747 is a deficient number, since it is larger than the sum of its proper divisors (12036893).

20568127747 is a wasteful number, since it uses less digits than its factorization.

20568127747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12036892.

The product of its (nonzero) digits is 1317120, while the sum is 49.

The spelling of 20568127747 in words is "twenty billion, five hundred sixty-eight million, one hundred twenty-seven thousand, seven hundred forty-seven".