317720 has 48 divisors (see below), whose sum is σ = 790560. Its totient is φ = 114816.

The previous prime is 317717. The next prime is 317729. The reversal of 317720 is 27713.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 317692 and 317701.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 317720.

It is not an unprimeable number, because it can be changed into a prime (317729) 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, 6737 + ... + 6783.

It is an arithmetic number, because the mean of its divisors is an integer number (16470).

2³¹⁷⁷²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 317720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395280).

317720 is an abundant number, since it is smaller than the sum of its proper divisors (472840).

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

317720 is a wasteful number, since it uses less digits than its factorization.

317720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 317720 is about 563.6665681056. Note that the first 3 decimals coincide. The cubic root of 317720 is about 68.2362028043.

The spelling of 317720 in words is "three hundred seventeen thousand, seven hundred twenty", and thus it is an iban number.