20858328217 has 2 divisors, whose sum is σ = 20858328218. Its totient is φ = 20858328216.

The previous prime is 20858328203. The next prime is 20858328289. The reversal of 20858328217 is 71282385802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12782789721 + 8075538496 = 113061^2 + 89864^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858328217 - 2¹¹ = 20858326169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858328817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429164108 + 10429164109.

It is an arithmetic number, because the mean of its divisors is an integer number (10429164109).

Almost surely, 2^20858328217 is an apocalyptic number.

It is an amenable number.

20858328217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858328217 is an equidigital number, since it uses as much as digits as its factorization.

20858328217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 20858328217 in words is "twenty billion, eight hundred fifty-eight million, three hundred twenty-eight thousand, two hundred seventeen".