21128940

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{409}}^1$

素因数の和:472

約数の個数: 144

約数和(自身を含む): 75216960

約数和(自身を除く): 54088020

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 41, 42, 45, 60, 63, 70, 82, 84, 90, 105, 123, 126, 140, 164, 180, 205, 210, 246, 252, 287, 315, 369, 409, 410, 420, 492, 574, 615, 630, 738, 818, 820, 861, 1148, 1227, 1230, 1260, 1435, 1476, 1636, 1722, 1845, 2045, 2454, 2460, 2583, 2863, 2870, 3444, 3681, 3690, 4090, 4305, 4908, 5166, 5726, 5740, 6135, 7362, 7380, 8180, 8589, 8610, 10332, 11452, 12270, 12915, 14315, 14724, 16769, 17178, 17220, 18405, 24540, 25767, 25830, 28630, 33538, 34356, 36810, 42945, 50307, 51534, 51660, 57260, 67076, 73620, 83845, 85890, 100614, 103068, 117383, 128835, 150921, 167690, 171780, 201228, 234766, 251535, 257670, 301842, 335380, 352149, 469532, 503070, 515340, 586915, 603684, 704298, 754605, 1006140, 1056447, 1173830, 1408596, 1509210, 1760745, 2112894, 2347660, 3018420, 3521490, 4225788, 5282235, 7042980, 10564470, 21128940]

約数ペア:

[(1, 21128940), (2, 10564470), (3, 7042980), (4, 5282235), (5, 4225788), (6, 3521490), (7, 3018420), (9, 2347660), (10, 2112894), (12, 1760745), (14, 1509210), (15, 1408596), (18, 1173830), (20, 1056447), (21, 1006140), (28, 754605), (30, 704298), (35, 603684), (36, 586915), (41, 515340), (42, 503070), (45, 469532), (60, 352149), (63, 335380), (70, 301842), (82, 257670), (84, 251535), (90, 234766), (105, 201228), (123, 171780), (126, 167690), (140, 150921), (164, 128835), (180, 117383), (205, 103068), (210, 100614), (246, 85890), (252, 83845), (287, 73620), (315, 67076), (369, 57260), (409, 51660), (410, 51534), (420, 50307), (492, 42945), (574, 36810), (615, 34356), (630, 33538), (738, 28630), (818, 25830), (820, 25767), (861, 24540), (1148, 18405), (1227, 17220), (1230, 17178), (1260, 16769), (1435, 14724), (1476, 14315), (1636, 12915), (1722, 12270), (1845, 11452), (2045, 10332), (2454, 8610), (2460, 8589), (2583, 8180), (2863, 7380), (2870, 7362), (3444, 6135), (3681, 5740), (3690, 5726), (4090, 5166), (4305, 4908)]