20832354171857 has 2 divisors, whose sum is σ = 20832354171858. Its totient is φ = 20832354171856.

The previous prime is 20832354171847. The next prime is 20832354171913. The reversal of 20832354171857 is 75817145323802.

It is a happy number.

It is an a-pointer prime, because the next prime (20832354171913) can be obtained adding 20832354171857 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19821764282896 + 1010589888961 = 4452164^2 + 1005281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20832354171857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20832354171817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10416177085928 + 10416177085929.

It is an arithmetic number, because the mean of its divisors is an integer number (10416177085929).

Almost surely, 2^{20832354171857} is an apocalyptic number.

It is an amenable number.

20832354171857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20832354171857 is an equidigital number, since it uses as much as digits as its factorization.

20832354171857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11289600, while the sum is 56.

The spelling of 20832354171857 in words is "twenty trillion, eight hundred thirty-two billion, three hundred fifty-four million, one hundred seventy-one thousand, eight hundred fifty-seven".