I divisori di 991980 sono 96, elencati qui di seguito: 1; 2; 3; 4; 5; 6; 9; 10; 11; 12; 15; 18; 20; 22; 27; 30; 33; 36; 44; 45; 54; 55; 60; 66; 90; 99; 108; 110; 132; 135; 165; 167; 180; 198; 220; 270; 297; 330; 334; 396; 495; 501; 540; 594; 660; 668; 835; 990; 1002; 1188; 1485; 1503; 1670; 1837; 1980; 2004; 2505; 2970; 3006; 3340; 3674; 4509; 5010; 5511; 5940; 6012; 7348; 7515; 9018; 9185; 10020; 11022; 15030; 16533; 18036; 18370; 22044; 22545; 27555; 30060; 33066; 36740; 45090; 49599; 55110; 66132; 82665; 90180; 99198; 110220; 165330; 198396; 247995; 330660; 495990; 991980
991961, 991962, 991963, 991964, 991965, 991966, 991967, 991968, 991969, 991970, 991971, 991972, 991973, 991974, 991975, 991976, 991977, 991978, 991979, 991981, 991982, 991983, 991984, 991985, 991986, 991987, 991988, 991989, 991990, 991991, 991992, 991993, 991994, 991995, 991996, 991997, 991998, 991999