21807240

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{1997}}^1$

素因数の和:2031

約数の個数: 128

約数和(自身を含む): 80559360

約数和(自身を除く): 58752120

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 15, 20, 21, 24, 26, 28, 30, 35, 39, 40, 42, 52, 56, 60, 65, 70, 78, 84, 91, 104, 105, 120, 130, 140, 156, 168, 182, 195, 210, 260, 273, 280, 312, 364, 390, 420, 455, 520, 546, 728, 780, 840, 910, 1092, 1365, 1560, 1820, 1997, 2184, 2730, 3640, 3994, 5460, 5991, 7988, 9985, 10920, 11982, 13979, 15976, 19970, 23964, 25961, 27958, 29955, 39940, 41937, 47928, 51922, 55916, 59910, 69895, 77883, 79880, 83874, 103844, 111832, 119820, 129805, 139790, 155766, 167748, 181727, 207688, 209685, 239640, 259610, 279580, 311532, 335496, 363454, 389415, 419370, 519220, 545181, 559160, 623064, 726908, 778830, 838740, 908635, 1038440, 1090362, 1453816, 1557660, 1677480, 1817270, 2180724, 2725905, 3115320, 3634540, 4361448, 5451810, 7269080, 10903620, 21807240]

約数ペア:

[(1, 21807240), (2, 10903620), (3, 7269080), (4, 5451810), (5, 4361448), (6, 3634540), (7, 3115320), (8, 2725905), (10, 2180724), (12, 1817270), (13, 1677480), (14, 1557660), (15, 1453816), (20, 1090362), (21, 1038440), (24, 908635), (26, 838740), (28, 778830), (30, 726908), (35, 623064), (39, 559160), (40, 545181), (42, 519220), (52, 419370), (56, 389415), (60, 363454), (65, 335496), (70, 311532), (78, 279580), (84, 259610), (91, 239640), (104, 209685), (105, 207688), (120, 181727), (130, 167748), (140, 155766), (156, 139790), (168, 129805), (182, 119820), (195, 111832), (210, 103844), (260, 83874), (273, 79880), (280, 77883), (312, 69895), (364, 59910), (390, 55916), (420, 51922), (455, 47928), (520, 41937), (546, 39940), (728, 29955), (780, 27958), (840, 25961), (910, 23964), (1092, 19970), (1365, 15976), (1560, 13979), (1820, 11982), (1997, 10920), (2184, 9985), (2730, 7988), (3640, 5991), (3994, 5460)]