How many km is 20 AU?
20 AU = 2,991,957,414 km
It is 2,991,957,414 km, so saying 2,991,957,414 km is fine — rounding is within 0.5%.
And how many AU is 20 km?
20 km = 0 AU
Formula: km = AU × 149,597,870.7
AU to km around this value
2 AU299,195,741km
4 AU598,391,483km
6 AU897,587,224km
8 AU1,196,782,966km
10 AU1,495,978,707km
12 AU1,795,174,448km
14 AU2,094,370,190km
16 AU2,393,565,931km
18 AU2,692,761,673km
20 AU2,991,957,414km
22 AU3,291,153,155km
24 AU3,590,348,897km
26 AU3,889,544,638km
28 AU4,188,740,380km
30 AU4,487,936,121km
32 AU4,787,131,862km
34 AU5,086,327,604km
36 AU5,385,523,345km
38 AU5,684,719,087km
40 AU5,983,914,828km