20848170517 has 4 divisors (see below), whose sum is σ = 20854646316. Its totient is φ = 20841694720.

The previous prime is 20848170493. The next prime is 20848170583. The reversal of 20848170517 is 71507184802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10648382481 + 10199788036 = 103191^2 + 100994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20848170517 - 2¹⁵ = 20848137749 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 (20848170587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3233068 + ... + 3239509.

It is an arithmetic number, because the mean of its divisors is an integer number (5213661579).

Almost surely, 2^20848170517 is an apocalyptic number.

It is an amenable number.

20848170517 is a deficient number, since it is larger than the sum of its proper divisors (6475799).

20848170517 is an equidigital number, since it uses as much as digits as its factorization.

20848170517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475798.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 20848170517 in words is "twenty billion, eight hundred forty-eight million, one hundred seventy thousand, five hundred seventeen".