21491820

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{461}}^1$

素因数の和:520

約数の個数: 144

約数和(自身を含む): 76684608

約数和(自身を除く): 55192788

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 37, 42, 45, 60, 63, 70, 74, 84, 90, 105, 111, 126, 140, 148, 180, 185, 210, 222, 252, 259, 315, 333, 370, 420, 444, 461, 518, 555, 630, 666, 740, 777, 922, 1036, 1110, 1260, 1295, 1332, 1383, 1554, 1665, 1844, 2220, 2305, 2331, 2590, 2766, 3108, 3227, 3330, 3885, 4149, 4610, 4662, 5180, 5532, 6454, 6660, 6915, 7770, 8298, 9220, 9324, 9681, 11655, 12908, 13830, 15540, 16135, 16596, 17057, 19362, 20745, 23310, 27660, 29043, 32270, 34114, 38724, 41490, 46620, 48405, 51171, 58086, 64540, 68228, 82980, 85285, 96810, 102342, 116172, 119399, 145215, 153513, 170570, 193620, 204684, 238798, 255855, 290430, 307026, 341140, 358197, 477596, 511710, 580860, 596995, 614052, 716394, 767565, 1023420, 1074591, 1193990, 1432788, 1535130, 1790985, 2149182, 2387980, 3070260, 3581970, 4298364, 5372955, 7163940, 10745910, 21491820]

約数ペア:

[(1, 21491820), (2, 10745910), (3, 7163940), (4, 5372955), (5, 4298364), (6, 3581970), (7, 3070260), (9, 2387980), (10, 2149182), (12, 1790985), (14, 1535130), (15, 1432788), (18, 1193990), (20, 1074591), (21, 1023420), (28, 767565), (30, 716394), (35, 614052), (36, 596995), (37, 580860), (42, 511710), (45, 477596), (60, 358197), (63, 341140), (70, 307026), (74, 290430), (84, 255855), (90, 238798), (105, 204684), (111, 193620), (126, 170570), (140, 153513), (148, 145215), (180, 119399), (185, 116172), (210, 102342), (222, 96810), (252, 85285), (259, 82980), (315, 68228), (333, 64540), (370, 58086), (420, 51171), (444, 48405), (461, 46620), (518, 41490), (555, 38724), (630, 34114), (666, 32270), (740, 29043), (777, 27660), (922, 23310), (1036, 20745), (1110, 19362), (1260, 17057), (1295, 16596), (1332, 16135), (1383, 15540), (1554, 13830), (1665, 12908), (1844, 11655), (2220, 9681), (2305, 9324), (2331, 9220), (2590, 8298), (2766, 7770), (3108, 6915), (3227, 6660), (3330, 6454), (3885, 5532), (4149, 5180), (4610, 4662)]