21378840

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{821}}^1$

素因数の和:873

約数の個数: 128

約数和(自身を含む): 75755520

約数和(自身を除く): 54376680

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 31, 35, 40, 42, 56, 60, 62, 70, 84, 93, 105, 120, 124, 140, 155, 168, 186, 210, 217, 248, 280, 310, 372, 420, 434, 465, 620, 651, 744, 821, 840, 868, 930, 1085, 1240, 1302, 1642, 1736, 1860, 2170, 2463, 2604, 3255, 3284, 3720, 4105, 4340, 4926, 5208, 5747, 6510, 6568, 8210, 8680, 9852, 11494, 12315, 13020, 16420, 17241, 19704, 22988, 24630, 25451, 26040, 28735, 32840, 34482, 45976, 49260, 50902, 57470, 68964, 76353, 86205, 98520, 101804, 114940, 127255, 137928, 152706, 172410, 178157, 203608, 229880, 254510, 305412, 344820, 356314, 381765, 509020, 534471, 610824, 689640, 712628, 763530, 890785, 1018040, 1068942, 1425256, 1527060, 1781570, 2137884, 2672355, 3054120, 3563140, 4275768, 5344710, 7126280, 10689420, 21378840]

約数ペア:

[(1, 21378840), (2, 10689420), (3, 7126280), (4, 5344710), (5, 4275768), (6, 3563140), (7, 3054120), (8, 2672355), (10, 2137884), (12, 1781570), (14, 1527060), (15, 1425256), (20, 1068942), (21, 1018040), (24, 890785), (28, 763530), (30, 712628), (31, 689640), (35, 610824), (40, 534471), (42, 509020), (56, 381765), (60, 356314), (62, 344820), (70, 305412), (84, 254510), (93, 229880), (105, 203608), (120, 178157), (124, 172410), (140, 152706), (155, 137928), (168, 127255), (186, 114940), (210, 101804), (217, 98520), (248, 86205), (280, 76353), (310, 68964), (372, 57470), (420, 50902), (434, 49260), (465, 45976), (620, 34482), (651, 32840), (744, 28735), (821, 26040), (840, 25451), (868, 24630), (930, 22988), (1085, 19704), (1240, 17241), (1302, 16420), (1642, 13020), (1736, 12315), (1860, 11494), (2170, 9852), (2463, 8680), (2604, 8210), (3255, 6568), (3284, 6510), (3720, 5747), (4105, 5208), (4340, 4926)]