21440640

素因数分解:

$2^7\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{859}}^1$

素因数の和:894

約数の個数: 128

約数和(自身を含む): 73684800

約数和(自身を除く): 52244160

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 32, 39, 40, 48, 52, 60, 64, 65, 78, 80, 96, 104, 120, 128, 130, 156, 160, 192, 195, 208, 240, 260, 312, 320, 384, 390, 416, 480, 520, 624, 640, 780, 832, 859, 960, 1040, 1248, 1560, 1664, 1718, 1920, 2080, 2496, 2577, 3120, 3436, 4160, 4295, 4992, 5154, 6240, 6872, 8320, 8590, 10308, 11167, 12480, 12885, 13744, 17180, 20616, 22334, 24960, 25770, 27488, 33501, 34360, 41232, 44668, 51540, 54976, 55835, 67002, 68720, 82464, 89336, 103080, 109952, 111670, 134004, 137440, 164928, 167505, 178672, 206160, 223340, 268008, 274880, 329856, 335010, 357344, 412320, 446680, 536016, 549760, 670020, 714688, 824640, 893360, 1072032, 1340040, 1429376, 1649280, 1786720, 2144064, 2680080, 3573440, 4288128, 5360160, 7146880, 10720320, 21440640]

約数ペア:

[(1, 21440640), (2, 10720320), (3, 7146880), (4, 5360160), (5, 4288128), (6, 3573440), (8, 2680080), (10, 2144064), (12, 1786720), (13, 1649280), (15, 1429376), (16, 1340040), (20, 1072032), (24, 893360), (26, 824640), (30, 714688), (32, 670020), (39, 549760), (40, 536016), (48, 446680), (52, 412320), (60, 357344), (64, 335010), (65, 329856), (78, 274880), (80, 268008), (96, 223340), (104, 206160), (120, 178672), (128, 167505), (130, 164928), (156, 137440), (160, 134004), (192, 111670), (195, 109952), (208, 103080), (240, 89336), (260, 82464), (312, 68720), (320, 67002), (384, 55835), (390, 54976), (416, 51540), (480, 44668), (520, 41232), (624, 34360), (640, 33501), (780, 27488), (832, 25770), (859, 24960), (960, 22334), (1040, 20616), (1248, 17180), (1560, 13744), (1664, 12885), (1718, 12480), (1920, 11167), (2080, 10308), (2496, 8590), (2577, 8320), (3120, 6872), (3436, 6240), (4160, 5154), (4295, 4992)]