21259980

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{359}}^1$

素因数の和:428

約数の個数: 144

約数和(自身を含む): 75479040

約数和(自身を除く): 54219060

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 47, 60, 63, 70, 84, 90, 94, 105, 126, 140, 141, 180, 188, 210, 235, 252, 282, 315, 329, 359, 420, 423, 470, 564, 630, 658, 705, 718, 846, 940, 987, 1077, 1260, 1316, 1410, 1436, 1645, 1692, 1795, 1974, 2115, 2154, 2513, 2820, 2961, 3231, 3290, 3590, 3948, 4230, 4308, 4935, 5026, 5385, 5922, 6462, 6580, 7180, 7539, 8460, 9870, 10052, 10770, 11844, 12565, 12924, 14805, 15078, 16155, 16873, 19740, 21540, 22617, 25130, 29610, 30156, 32310, 33746, 37695, 45234, 50260, 50619, 59220, 64620, 67492, 75390, 84365, 90468, 101238, 113085, 118111, 150780, 151857, 168730, 202476, 226170, 236222, 253095, 303714, 337460, 354333, 452340, 472444, 506190, 590555, 607428, 708666, 759285, 1012380, 1062999, 1181110, 1417332, 1518570, 1771665, 2125998, 2362220, 3037140, 3543330, 4251996, 5314995, 7086660, 10629990, 21259980]

約数ペア:

[(1, 21259980), (2, 10629990), (3, 7086660), (4, 5314995), (5, 4251996), (6, 3543330), (7, 3037140), (9, 2362220), (10, 2125998), (12, 1771665), (14, 1518570), (15, 1417332), (18, 1181110), (20, 1062999), (21, 1012380), (28, 759285), (30, 708666), (35, 607428), (36, 590555), (42, 506190), (45, 472444), (47, 452340), (60, 354333), (63, 337460), (70, 303714), (84, 253095), (90, 236222), (94, 226170), (105, 202476), (126, 168730), (140, 151857), (141, 150780), (180, 118111), (188, 113085), (210, 101238), (235, 90468), (252, 84365), (282, 75390), (315, 67492), (329, 64620), (359, 59220), (420, 50619), (423, 50260), (470, 45234), (564, 37695), (630, 33746), (658, 32310), (705, 30156), (718, 29610), (846, 25130), (940, 22617), (987, 21540), (1077, 19740), (1260, 16873), (1316, 16155), (1410, 15078), (1436, 14805), (1645, 12924), (1692, 12565), (1795, 11844), (1974, 10770), (2115, 10052), (2154, 9870), (2513, 8460), (2820, 7539), (2961, 7180), (3231, 6580), (3290, 6462), (3590, 5922), (3948, 5385), (4230, 5026), (4308, 4935)]