I divisori di 19997998 sono 8, elencati qui di seguito: 1; 2; 269; 538; 37171; 74342; 9998999; 19997998
19997979, 19997980, 19997981, 19997982, 19997983, 19997984, 19997985, 19997986, 19997987, 19997988, 19997989, 19997990, 19997991, 19997992, 19997993, 19997994, 19997995, 19997996, 19997997, 19997999, 19998000, 19998001, 19998002, 19998003, 19998004, 19998005, 19998006, 19998007, 19998008, 19998009, 19998010, 19998011, 19998012, 19998013, 19998014, 19998015, 19998016, 19998017