21147320

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{227}}^1$

素因数の和:392

約数の個数: 64

約数和(自身を含む): 50971680

約数和(自身を除く): 29824360

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 137, 170, 227, 274, 340, 454, 548, 680, 685, 908, 1096, 1135, 1370, 1816, 2270, 2329, 2740, 3859, 4540, 4658, 5480, 7718, 9080, 9316, 11645, 15436, 18632, 19295, 23290, 30872, 31099, 38590, 46580, 62198, 77180, 93160, 124396, 154360, 155495, 248792, 310990, 528683, 621980, 1057366, 1243960, 2114732, 2643415, 4229464, 5286830, 10573660, 21147320]

約数ペア:

[(1, 21147320), (2, 10573660), (4, 5286830), (5, 4229464), (8, 2643415), (10, 2114732), (17, 1243960), (20, 1057366), (34, 621980), (40, 528683), (68, 310990), (85, 248792), (136, 155495), (137, 154360), (170, 124396), (227, 93160), (274, 77180), (340, 62198), (454, 46580), (548, 38590), (680, 31099), (685, 30872), (908, 23290), (1096, 19295), (1135, 18632), (1370, 15436), (1816, 11645), (2270, 9316), (2329, 9080), (2740, 7718), (3859, 5480), (4540, 4658)]