The card number of a general credit card is 16 digits, and the card number of a debit card varies from 16 digits to 19 digits according to different banks. /kloc-unit settlement card with 0/6 digits at the beginning, which is used for withdrawal and transfer on ATM machines.

Twenty people. Generally, it starts with the province (for example, Henan is 4 10). Company accounts are divided into four categories: basic deposit account, general accounts, temporary accounts and special accounts. Among them, a company can only open one basic deposit account. For other general accounts, a company can open multiple accounts according to business needs, and the number is not limited.