What two numbers add up to 1620?

There are infinite combinations of two numbers that add up to 1620. Here are some examples using negative numbers:

-1 + 1621 = 1620
-2 + 1622 = 1620
-3 + 1623 = 1620
...

Here are some examples using two fractions that will add up to 1620:

1620/2 + 1620/2 = 1620
3240/3 + 1620/3 = 1620
4860/4 + 1620/4 = 1620
...

And here are some examples using two decimal numbers that will add up to 1620:

1.25 + 1618.75 = 1620
2.50 + 1617.5 = 1620
3.75 + 1616.25 = 1620
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1620?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 1620. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 1620?" has 810 answers:

1 + 1619 = 1620
2 + 1618 = 1620
3 + 1617 = 1620
.
.
808 + 812 = 1620
809 + 811 = 1620
810 + 810 = 1620

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 1620 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1621?
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