20000 mAh at 3.6v is 72wh this is under the carryon limit. The power pack is 20000 milliamp
hours to convert to amps divide by 1000 so 20 amps. To convert amps to
watts you multiply the voltage by the amps at 5 volts the pack is 100
watts.
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In these cases, most likely they measure with lithium battery cell voltage, which is 3.6V or 3.7V. By time 3.6 (or 3.7), then divided by 1000, it will be its accurate Watt-hour capacity. For example, a 10,000mAh battery actual capacity is 10000 x 3.6 /1000 = 36 Watt-hour.
