Executives at Denny’s Corp., which has more than 1,700 franchised diners around the country, told investors this week that franchisees representing more than half of those restaurants have been approved for PPP loans. McDonald’s Corp., which has more than 13,000 franchised restaurants across the country, told its investors that it thinks most of its franchisees have obtained PPP or other small-business loans backed by the federal government. Papa John’s International Inc., which has more than 2,500 franchised locations in the U.S., said a lot of its franchisees have probably “looked” at PPP loans.