Collectible coins from the United States, such as those issued in 2020, can include various denominations and designs, often featuring unique characteristics based on their mint location, such as the Denver Mint. A roll typically contains a set number of coins, often 25 or 50, and may contain specific types of dollars, such as coin series or commemoratives. Collectors often seek these coins for their historical significance, rarity, or unique minting characteristics. The value of such coins can vary based on condition, demand, and factors like limited editions or special releases.