317820 has 24 divisors (see below), whose sum is σ = 890064. Its totient is φ = 84736.

The previous prime is 317797. The next prime is 317827. The reversal of 317820 is 28713.

317820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2589 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (37086).

2³¹⁷⁸²⁰ is an apocalyptic number.

317820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

317820 is an abundant number, since it is smaller than the sum of its proper divisors (572244).

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

317820 is a wasteful number, since it uses less digits than its factorization.

317820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309 (or 5307 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 317820 is about 563.7552660508. The cubic root of 317820 is about 68.2433609987.

The spelling of 317820 in words is "three hundred seventeen thousand, eight hundred twenty".