How many countries are in 2 continents?

Only by mainland, 6 countries are in 2 continents:

Panama (North & South America)

Egypt (Africa & Asia)

Turkey (Europe & Asia)

Georgia (Europe & Asia)

Azerbaijan (Europe & Asia)

Kazakhstan (Europe & Asia)

By all territories, an additional 8 countries are in 2 continents:

Spain (Europe & Africa)

Yemen (Asia & Africa)

Japan (Asia & Oceania)

Norway (Europe & Antarctica)

Australia (Oceania & Antarctica)

New Zealand (Oceania & Antarctica)

Argentina (South America & Australia)

Denmark (Europe & North America)

However, 3 countries are in 3 continents, and 2 countries are in all 7 continents.

United States (North America, Asia, & Oceania)

Russia (Europe, Asia, & North America)

Chile (South America, Antarctica & Oceania)

United Kingdom (Europe, North America, Antarctica, Oceania, South America, & Asia)

France (Europe, North America, South America, Antarctica, Africa, Asia & Oceania)