21371560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{601}}^1$

素因数の和:746

約数の個数: 64

約数和(自身を含む): 55480320

約数和(自身を除く): 34108760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 127, 140, 254, 280, 508, 601, 635, 889, 1016, 1202, 1270, 1778, 2404, 2540, 3005, 3556, 4207, 4445, 4808, 5080, 6010, 7112, 8414, 8890, 12020, 16828, 17780, 21035, 24040, 33656, 35560, 42070, 76327, 84140, 152654, 168280, 305308, 381635, 534289, 610616, 763270, 1068578, 1526540, 2137156, 2671445, 3053080, 4274312, 5342890, 10685780, 21371560]

約数ペア:

[(1, 21371560), (2, 10685780), (4, 5342890), (5, 4274312), (7, 3053080), (8, 2671445), (10, 2137156), (14, 1526540), (20, 1068578), (28, 763270), (35, 610616), (40, 534289), (56, 381635), (70, 305308), (127, 168280), (140, 152654), (254, 84140), (280, 76327), (508, 42070), (601, 35560), (635, 33656), (889, 24040), (1016, 21035), (1202, 17780), (1270, 16828), (1778, 12020), (2404, 8890), (2540, 8414), (3005, 7112), (3556, 6010), (4207, 5080), (4445, 4808)]