19990980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1$

素因数の和:218

約数の個数: 144

約数和(自身を含む): 66044160

約数和(自身を除く): 46053180

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 17, 18, 20, 30, 34, 36, 45, 47, 51, 60, 68, 85, 90, 94, 102, 139, 141, 153, 170, 180, 188, 204, 235, 255, 278, 282, 306, 340, 417, 423, 470, 510, 556, 564, 612, 695, 705, 765, 799, 834, 846, 940, 1020, 1251, 1390, 1410, 1530, 1598, 1668, 1692, 2085, 2115, 2363, 2397, 2502, 2780, 2820, 3060, 3196, 3995, 4170, 4230, 4726, 4794, 5004, 6255, 6533, 7089, 7191, 7990, 8340, 8460, 9452, 9588, 11815, 11985, 12510, 13066, 14178, 14382, 15980, 19599, 21267, 23630, 23970, 25020, 26132, 28356, 28764, 32665, 35445, 35955, 39198, 42534, 47260, 47940, 58797, 65330, 70890, 71910, 78396, 85068, 97995, 106335, 111061, 117594, 130660, 141780, 143820, 195990, 212670, 222122, 235188, 293985, 333183, 391980, 425340, 444244, 555305, 587970, 666366, 999549, 1110610, 1175940, 1332732, 1665915, 1999098, 2221220, 3331830, 3998196, 4997745, 6663660, 9995490, 19990980]

約数ペア:

[(1, 19990980), (2, 9995490), (3, 6663660), (4, 4997745), (5, 3998196), (6, 3331830), (9, 2221220), (10, 1999098), (12, 1665915), (15, 1332732), (17, 1175940), (18, 1110610), (20, 999549), (30, 666366), (34, 587970), (36, 555305), (45, 444244), (47, 425340), (51, 391980), (60, 333183), (68, 293985), (85, 235188), (90, 222122), (94, 212670), (102, 195990), (139, 143820), (141, 141780), (153, 130660), (170, 117594), (180, 111061), (188, 106335), (204, 97995), (235, 85068), (255, 78396), (278, 71910), (282, 70890), (306, 65330), (340, 58797), (417, 47940), (423, 47260), (470, 42534), (510, 39198), (556, 35955), (564, 35445), (612, 32665), (695, 28764), (705, 28356), (765, 26132), (799, 25020), (834, 23970), (846, 23630), (940, 21267), (1020, 19599), (1251, 15980), (1390, 14382), (1410, 14178), (1530, 13066), (1598, 12510), (1668, 11985), (1692, 11815), (2085, 9588), (2115, 9452), (2363, 8460), (2397, 8340), (2502, 7990), (2780, 7191), (2820, 7089), (3060, 6533), (3196, 6255), (3995, 5004), (4170, 4794), (4230, 4726)]