820704204171 has 12 divisors (see below), whose sum is σ = 1188589500280. Its totient is φ = 545692502880.

The previous prime is 820704204157. The next prime is 820704204179. The reversal of 820704204171 is 171402407028.

It is not a de Polignac number, because 820704204171 - 2³⁰ = 819630462347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820704204179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120299170 + ... + 120305991.

Almost surely, 2^820704204171 is an apocalyptic number.

820704204171 is a deficient number, since it is larger than the sum of its proper divisors (367885296109).

820704204171 is a wasteful number, since it uses less digits than its factorization.

820704204171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240605546 (or 240605543 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 820704204171 in words is "eight hundred twenty billion, seven hundred four million, two hundred four thousand, one hundred seventy-one".