What two numbers add up to 1820?

There are infinite combinations of two numbers that add up to 1820. Here are some examples using negative numbers:

-1 + 1821 = 1820
-2 + 1822 = 1820
-3 + 1823 = 1820
...

Here are some examples using two fractions that will add up to 1820:

1820/2 + 1820/2 = 1820
3640/3 + 1820/3 = 1820
5460/4 + 1820/4 = 1820
...

And here are some examples using two decimal numbers that will add up to 1820:

1.25 + 1818.75 = 1820
2.50 + 1817.5 = 1820
3.75 + 1816.25 = 1820
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1820?", 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 1820. (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 1820?" has 910 answers:

1 + 1819 = 1820
2 + 1818 = 1820
3 + 1817 = 1820
.
.
908 + 912 = 1820
909 + 911 = 1820
910 + 910 = 1820

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 1820 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1821?
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