20647141755717 has 16 divisors (see below), whose sum is σ = 27693558097280. Its totient is φ = 13682933812800.

The previous prime is 20647141755689. The next prime is 20647141755739. The reversal of 20647141755717 is 71755714174602.

It is not a de Polignac number, because 20647141755717 - 2¹⁴ = 20647141739333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20647141755217) 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, 23381134 + ... + 24248127.

It is an arithmetic number, because the mean of its divisors is an integer number (1730847381080).

Almost surely, 2^{20647141755717} is an apocalyptic number.

It is an amenable number.

20647141755717 is a deficient number, since it is larger than the sum of its proper divisors (7046416341563).

20647141755717 is a wasteful number, since it uses less digits than its factorization.

20647141755717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47630124.

The product of its (nonzero) digits is 11524800, while the sum is 57.

The spelling of 20647141755717 in words is "twenty trillion, six hundred forty-seven billion, one hundred forty-one million, seven hundred fifty-five thousand, seven hundred seventeen".