20686820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1$

素因数の和:154

約数の個数: 144

約数和(自身を含む): 58605120

約数和(自身を除く): 37918300

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 19, 20, 22, 28, 35, 38, 44, 49, 55, 70, 76, 77, 95, 98, 101, 110, 133, 140, 154, 190, 196, 202, 209, 220, 245, 266, 308, 380, 385, 404, 418, 490, 505, 532, 539, 665, 707, 770, 836, 931, 980, 1010, 1045, 1078, 1111, 1330, 1414, 1463, 1540, 1862, 1919, 2020, 2090, 2156, 2222, 2660, 2695, 2828, 2926, 3535, 3724, 3838, 4180, 4444, 4655, 4949, 5390, 5555, 5852, 7070, 7315, 7676, 7777, 9310, 9595, 9898, 10241, 10780, 11110, 13433, 14140, 14630, 15554, 18620, 19190, 19796, 20482, 21109, 22220, 24745, 26866, 29260, 31108, 38380, 38885, 40964, 42218, 49490, 51205, 53732, 54439, 67165, 77770, 84436, 94031, 98980, 102410, 105545, 108878, 134330, 147763, 155540, 188062, 204820, 211090, 217756, 268660, 272195, 295526, 376124, 422180, 470155, 544390, 591052, 738815, 940310, 1034341, 1088780, 1477630, 1880620, 2068682, 2955260, 4137364, 5171705, 10343410, 20686820]

約数ペア:

[(1, 20686820), (2, 10343410), (4, 5171705), (5, 4137364), (7, 2955260), (10, 2068682), (11, 1880620), (14, 1477630), (19, 1088780), (20, 1034341), (22, 940310), (28, 738815), (35, 591052), (38, 544390), (44, 470155), (49, 422180), (55, 376124), (70, 295526), (76, 272195), (77, 268660), (95, 217756), (98, 211090), (101, 204820), (110, 188062), (133, 155540), (140, 147763), (154, 134330), (190, 108878), (196, 105545), (202, 102410), (209, 98980), (220, 94031), (245, 84436), (266, 77770), (308, 67165), (380, 54439), (385, 53732), (404, 51205), (418, 49490), (490, 42218), (505, 40964), (532, 38885), (539, 38380), (665, 31108), (707, 29260), (770, 26866), (836, 24745), (931, 22220), (980, 21109), (1010, 20482), (1045, 19796), (1078, 19190), (1111, 18620), (1330, 15554), (1414, 14630), (1463, 14140), (1540, 13433), (1862, 11110), (1919, 10780), (2020, 10241), (2090, 9898), (2156, 9595), (2222, 9310), (2660, 7777), (2695, 7676), (2828, 7315), (2926, 7070), (3535, 5852), (3724, 5555), (3838, 5390), (4180, 4949), (4444, 4655)]