19998720

素因数分解:

$2^{11}\times 3^2\times 5^1\times 7^1\times {\mathrm{31}}^1$

素因数の和:71

約数の個数: 288

約数和(自身を含む): 81768960

約数和(自身を除く): 61770240

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 28, 30, 31, 32, 35, 36, 40, 42, 45, 48, 56, 60, 62, 63, 64, 70, 72, 80, 84, 90, 93, 96, 105, 112, 120, 124, 126, 128, 140, 144, 155, 160, 168, 180, 186, 192, 210, 217, 224, 240, 248, 252, 256, 279, 280, 288, 310, 315, 320, 336, 360, 372, 384, 420, 434, 448, 465, 480, 496, 504, 512, 558, 560, 576, 620, 630, 640, 651, 672, 720, 744, 768, 840, 868, 896, 930, 960, 992, 1008, 1024, 1085, 1116, 1120, 1152, 1240, 1260, 1280, 1302, 1344, 1395, 1440, 1488, 1536, 1680, 1736, 1792, 1860, 1920, 1953, 1984, 2016, 2048, 2170, 2232, 2240, 2304, 2480, 2520, 2560, 2604, 2688, 2790, 2880, 2976, 3072, 3255, 3360, 3472, 3584, 3720, 3840, 3906, 3968, 4032, 4340, 4464, 4480, 4608, 4960, 5040, 5120, 5208, 5376, 5580, 5760, 5952, 6144, 6510, 6720, 6944, 7168, 7440, 7680, 7812, 7936, 8064, 8680, 8928, 8960, 9216, 9765, 9920, 10080, 10240, 10416, 10752, 11160, 11520, 11904, 13020, 13440, 13888, 14336, 14880, 15360, 15624, 15872, 16128, 17360, 17856, 17920, 18432, 19530, 19840, 20160, 20832, 21504, 22320, 23040, 23808, 26040, 26880, 27776, 29760, 30720, 31248, 31744, 32256, 34720, 35712, 35840, 39060, 39680, 40320, 41664, 43008, 44640, 46080, 47616, 52080, 53760, 55552, 59520, 62496, 63488, 64512, 69440, 71424, 71680, 78120, 79360, 80640, 83328, 89280, 92160, 95232, 104160, 107520, 111104, 119040, 124992, 129024, 138880, 142848, 156240, 158720, 161280, 166656, 178560, 190464, 208320, 215040, 222208, 238080, 249984, 277760, 285696, 312480, 317440, 322560, 333312, 357120, 416640, 444416, 476160, 499968, 555520, 571392, 624960, 645120, 666624, 714240, 833280, 952320, 999936, 1111040, 1249920, 1333248, 1428480, 1666560, 1999872, 2222080, 2499840, 2856960, 3333120, 3999744, 4999680, 6666240, 9999360, 19998720]

約数ペア:

[(1, 19998720), (2, 9999360), (3, 6666240), (4, 4999680), (5, 3999744), (6, 3333120), (7, 2856960), (8, 2499840), (9, 2222080), (10, 1999872), (12, 1666560), (14, 1428480), (15, 1333248), (16, 1249920), (18, 1111040), (20, 999936), (21, 952320), (24, 833280), (28, 714240), (30, 666624), (31, 645120), (32, 624960), (35, 571392), (36, 555520), (40, 499968), (42, 476160), (45, 444416), (48, 416640), (56, 357120), (60, 333312), (62, 322560), (63, 317440), (64, 312480), (70, 285696), (72, 277760), (80, 249984), (84, 238080), (90, 222208), (93, 215040), (96, 208320), (105, 190464), (112, 178560), (120, 166656), (124, 161280), (126, 158720), (128, 156240), (140, 142848), (144, 138880), (155, 129024), (160, 124992), (168, 119040), (180, 111104), (186, 107520), (192, 104160), (210, 95232), (217, 92160), (224, 89280), (240, 83328), (248, 80640), (252, 79360), (256, 78120), (279, 71680), (280, 71424), (288, 69440), (310, 64512), (315, 63488), (320, 62496), (336, 59520), (360, 55552), (372, 53760), (384, 52080), (420, 47616), (434, 46080), (448, 44640), (465, 43008), (480, 41664), (496, 40320), (504, 39680), (512, 39060), (558, 35840), (560, 35712), (576, 34720), (620, 32256), (630, 31744), (640, 31248), (651, 30720), (672, 29760), (720, 27776), (744, 26880), (768, 26040), (840, 23808), (868, 23040), (896, 22320), (930, 21504), (960, 20832), (992, 20160), (1008, 19840), (1024, 19530), (1085, 18432), (1116, 17920), (1120, 17856), (1152, 17360), (1240, 16128), (1260, 15872), (1280, 15624), (1302, 15360), (1344, 14880), (1395, 14336), (1440, 13888), (1488, 13440), (1536, 13020), (1680, 11904), (1736, 11520), (1792, 11160), (1860, 10752), (1920, 10416), (1953, 10240), (1984, 10080), (2016, 9920), (2048, 9765), (2170, 9216), (2232, 8960), (2240, 8928), (2304, 8680), (2480, 8064), (2520, 7936), (2560, 7812), (2604, 7680), (2688, 7440), (2790, 7168), (2880, 6944), (2976, 6720), (3072, 6510), (3255, 6144), (3360, 5952), (3472, 5760), (3584, 5580), (3720, 5376), (3840, 5208), (3906, 5120), (3968, 5040), (4032, 4960), (4340, 4608), (4464, 4480)]