19978560

素因数分解:

$2^6\times 3^2\times 5^1\times 7^1\times {\mathrm{991}}^1$

素因数の和:1021

約数の個数: 168

約数和(自身を含む): 78614016

約数和(自身を除く): 58635456

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 28, 30, 32, 35, 36, 40, 42, 45, 48, 56, 60, 63, 64, 70, 72, 80, 84, 90, 96, 105, 112, 120, 126, 140, 144, 160, 168, 180, 192, 210, 224, 240, 252, 280, 288, 315, 320, 336, 360, 420, 448, 480, 504, 560, 576, 630, 672, 720, 840, 960, 991, 1008, 1120, 1260, 1344, 1440, 1680, 1982, 2016, 2240, 2520, 2880, 2973, 3360, 3964, 4032, 4955, 5040, 5946, 6720, 6937, 7928, 8919, 9910, 10080, 11892, 13874, 14865, 15856, 17838, 19820, 20160, 20811, 23784, 27748, 29730, 31712, 34685, 35676, 39640, 41622, 44595, 47568, 55496, 59460, 62433, 63424, 69370, 71352, 79280, 83244, 89190, 95136, 104055, 110992, 118920, 124866, 138740, 142704, 158560, 166488, 178380, 190272, 208110, 221984, 237840, 249732, 277480, 285408, 312165, 317120, 332976, 356760, 416220, 443968, 475680, 499464, 554960, 570816, 624330, 665952, 713520, 832440, 951360, 998928, 1109920, 1248660, 1331904, 1427040, 1664880, 1997856, 2219840, 2497320, 2854080, 3329760, 3995712, 4994640, 6659520, 9989280, 19978560]

約数ペア:

[(1, 19978560), (2, 9989280), (3, 6659520), (4, 4994640), (5, 3995712), (6, 3329760), (7, 2854080), (8, 2497320), (9, 2219840), (10, 1997856), (12, 1664880), (14, 1427040), (15, 1331904), (16, 1248660), (18, 1109920), (20, 998928), (21, 951360), (24, 832440), (28, 713520), (30, 665952), (32, 624330), (35, 570816), (36, 554960), (40, 499464), (42, 475680), (45, 443968), (48, 416220), (56, 356760), (60, 332976), (63, 317120), (64, 312165), (70, 285408), (72, 277480), (80, 249732), (84, 237840), (90, 221984), (96, 208110), (105, 190272), (112, 178380), (120, 166488), (126, 158560), (140, 142704), (144, 138740), (160, 124866), (168, 118920), (180, 110992), (192, 104055), (210, 95136), (224, 89190), (240, 83244), (252, 79280), (280, 71352), (288, 69370), (315, 63424), (320, 62433), (336, 59460), (360, 55496), (420, 47568), (448, 44595), (480, 41622), (504, 39640), (560, 35676), (576, 34685), (630, 31712), (672, 29730), (720, 27748), (840, 23784), (960, 20811), (991, 20160), (1008, 19820), (1120, 17838), (1260, 15856), (1344, 14865), (1440, 13874), (1680, 11892), (1982, 10080), (2016, 9910), (2240, 8919), (2520, 7928), (2880, 6937), (2973, 6720), (3360, 5946), (3964, 5040), (4032, 4955)]