20556722207017 has 8 divisors (see below), whose sum is σ = 20751336755136. Its totient is φ = 20362153874832.

The previous prime is 20556722207011. The next prime is 20556722207027. The reversal of 20556722207017 is 71070222765502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20556722207017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556722207011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10659853 + ... + 12439690.

It is an arithmetic number, because the mean of its divisors is an integer number (2593917094392).

Almost surely, 2^{20556722207017} is an apocalyptic number.

It is an amenable number.

20556722207017 is a deficient number, since it is larger than the sum of its proper divisors (194614548119).

20556722207017 is a wasteful number, since it uses less digits than its factorization.

20556722207017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23107967.

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 20556722207017 in words is "twenty trillion, five hundred fifty-six billion, seven hundred twenty-two million, two hundred seven thousand, seventeen".