20478960

素因数分解:

$2^4\times 3^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{499}}^1$

素因数の和:540

約数の個数: 160

約数和(自身を含む): 74400000

約数和(自身を除く): 53921040

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 19, 20, 24, 27, 30, 36, 38, 40, 45, 48, 54, 57, 60, 72, 76, 80, 90, 95, 108, 114, 120, 135, 144, 152, 171, 180, 190, 216, 228, 240, 270, 285, 304, 342, 360, 380, 432, 456, 499, 513, 540, 570, 684, 720, 760, 855, 912, 998, 1026, 1080, 1140, 1368, 1497, 1520, 1710, 1996, 2052, 2160, 2280, 2495, 2565, 2736, 2994, 3420, 3992, 4104, 4491, 4560, 4990, 5130, 5988, 6840, 7485, 7984, 8208, 8982, 9481, 9980, 10260, 11976, 13473, 13680, 14970, 17964, 18962, 19960, 20520, 22455, 23952, 26946, 28443, 29940, 35928, 37924, 39920, 41040, 44910, 47405, 53892, 56886, 59880, 67365, 71856, 75848, 85329, 89820, 94810, 107784, 113772, 119760, 134730, 142215, 151696, 170658, 179640, 189620, 215568, 227544, 255987, 269460, 284430, 341316, 359280, 379240, 426645, 455088, 511974, 538920, 568860, 682632, 758480, 853290, 1023948, 1077840, 1137720, 1279935, 1365264, 1706580, 2047896, 2275440, 2559870, 3413160, 4095792, 5119740, 6826320, 10239480, 20478960]

約数ペア:

[(1, 20478960), (2, 10239480), (3, 6826320), (4, 5119740), (5, 4095792), (6, 3413160), (8, 2559870), (9, 2275440), (10, 2047896), (12, 1706580), (15, 1365264), (16, 1279935), (18, 1137720), (19, 1077840), (20, 1023948), (24, 853290), (27, 758480), (30, 682632), (36, 568860), (38, 538920), (40, 511974), (45, 455088), (48, 426645), (54, 379240), (57, 359280), (60, 341316), (72, 284430), (76, 269460), (80, 255987), (90, 227544), (95, 215568), (108, 189620), (114, 179640), (120, 170658), (135, 151696), (144, 142215), (152, 134730), (171, 119760), (180, 113772), (190, 107784), (216, 94810), (228, 89820), (240, 85329), (270, 75848), (285, 71856), (304, 67365), (342, 59880), (360, 56886), (380, 53892), (432, 47405), (456, 44910), (499, 41040), (513, 39920), (540, 37924), (570, 35928), (684, 29940), (720, 28443), (760, 26946), (855, 23952), (912, 22455), (998, 20520), (1026, 19960), (1080, 18962), (1140, 17964), (1368, 14970), (1497, 13680), (1520, 13473), (1710, 11976), (1996, 10260), (2052, 9980), (2160, 9481), (2280, 8982), (2495, 8208), (2565, 7984), (2736, 7485), (2994, 6840), (3420, 5988), (3992, 5130), (4104, 4990), (4491, 4560)]