21507920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{199}}^1$

素因数の和:412

約数の個数: 80

約数和(自身を含む): 57734400

約数和(自身を除く): 36226480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 193, 199, 280, 386, 398, 560, 772, 796, 965, 995, 1351, 1393, 1544, 1592, 1930, 1990, 2702, 2786, 3088, 3184, 3860, 3980, 5404, 5572, 6755, 6965, 7720, 7960, 10808, 11144, 13510, 13930, 15440, 15920, 21616, 22288, 27020, 27860, 38407, 54040, 55720, 76814, 108080, 111440, 153628, 192035, 268849, 307256, 384070, 537698, 614512, 768140, 1075396, 1344245, 1536280, 2150792, 2688490, 3072560, 4301584, 5376980, 10753960, 21507920]

約数ペア:

[(1, 21507920), (2, 10753960), (4, 5376980), (5, 4301584), (7, 3072560), (8, 2688490), (10, 2150792), (14, 1536280), (16, 1344245), (20, 1075396), (28, 768140), (35, 614512), (40, 537698), (56, 384070), (70, 307256), (80, 268849), (112, 192035), (140, 153628), (193, 111440), (199, 108080), (280, 76814), (386, 55720), (398, 54040), (560, 38407), (772, 27860), (796, 27020), (965, 22288), (995, 21616), (1351, 15920), (1393, 15440), (1544, 13930), (1592, 13510), (1930, 11144), (1990, 10808), (2702, 7960), (2786, 7720), (3088, 6965), (3184, 6755), (3860, 5572), (3980, 5404)]