820320172 has 24 divisors (see below), whose sum is σ = 1674125600. Its totient is φ = 351565200.

The previous prime is 820320161. The next prime is 820320181. The reversal of 820320172 is 271023028.

820320172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297579 + ... + 300322.

Almost surely, 2^820320172 is an apocalyptic number.

It is an amenable number.

820320172 is an abundant number, since it is smaller than the sum of its proper divisors (853805428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820320172 is a wasteful number, since it uses less digits than its factorization.

820320172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597926 (or 597910 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 820320172 is about 28641.2320265732. The cubic root of 820320172 is about 936.1119667236. Note that the first 3 decimals are identical.

The spelling of 820320172 in words is "eight hundred twenty million, three hundred twenty thousand, one hundred seventy-two".