20665540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{457}}^1$

素因数の和:509

約数の個数: 96

約数和(自身を含む): 55399680

約数和(自身を除く): 34734140

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 19, 20, 28, 34, 35, 38, 68, 70, 76, 85, 95, 119, 133, 140, 170, 190, 238, 266, 323, 340, 380, 457, 476, 532, 595, 646, 665, 914, 1190, 1292, 1330, 1615, 1828, 2261, 2285, 2380, 2660, 3199, 3230, 4522, 4570, 6398, 6460, 7769, 8683, 9044, 9140, 11305, 12796, 15538, 15995, 17366, 22610, 31076, 31990, 34732, 38845, 43415, 45220, 54383, 60781, 63980, 77690, 86830, 108766, 121562, 147611, 155380, 173660, 217532, 243124, 271915, 295222, 303905, 543830, 590444, 607810, 738055, 1033277, 1087660, 1215620, 1476110, 2066554, 2952220, 4133108, 5166385, 10332770, 20665540]

約数ペア:

[(1, 20665540), (2, 10332770), (4, 5166385), (5, 4133108), (7, 2952220), (10, 2066554), (14, 1476110), (17, 1215620), (19, 1087660), (20, 1033277), (28, 738055), (34, 607810), (35, 590444), (38, 543830), (68, 303905), (70, 295222), (76, 271915), (85, 243124), (95, 217532), (119, 173660), (133, 155380), (140, 147611), (170, 121562), (190, 108766), (238, 86830), (266, 77690), (323, 63980), (340, 60781), (380, 54383), (457, 45220), (476, 43415), (532, 38845), (595, 34732), (646, 31990), (665, 31076), (914, 22610), (1190, 17366), (1292, 15995), (1330, 15538), (1615, 12796), (1828, 11305), (2261, 9140), (2285, 9044), (2380, 8683), (2660, 7769), (3199, 6460), (3230, 6398), (4522, 4570)]