21216680

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{761}}^1$

素因数の和:830

約数の個数: 64

約数和(自身を含む): 51846480

約数和(自身を除く): 30629800

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 41, 68, 82, 85, 136, 164, 170, 205, 328, 340, 410, 680, 697, 761, 820, 1394, 1522, 1640, 2788, 3044, 3485, 3805, 5576, 6088, 6970, 7610, 12937, 13940, 15220, 25874, 27880, 30440, 31201, 51748, 62402, 64685, 103496, 124804, 129370, 156005, 249608, 258740, 312010, 517480, 530417, 624020, 1060834, 1248040, 2121668, 2652085, 4243336, 5304170, 10608340, 21216680]

約数ペア:

[(1, 21216680), (2, 10608340), (4, 5304170), (5, 4243336), (8, 2652085), (10, 2121668), (17, 1248040), (20, 1060834), (34, 624020), (40, 530417), (41, 517480), (68, 312010), (82, 258740), (85, 249608), (136, 156005), (164, 129370), (170, 124804), (205, 103496), (328, 64685), (340, 62402), (410, 51748), (680, 31201), (697, 30440), (761, 27880), (820, 25874), (1394, 15220), (1522, 13940), (1640, 12937), (2788, 7610), (3044, 6970), (3485, 6088), (3805, 5576)]