21054160

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{113}}^1\times {\mathrm{137}}^1$

素因数の和:280

約数の個数: 80

約数和(自身を含む): 52670736

約数和(自身を除く): 31616576

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 113, 136, 137, 170, 226, 272, 274, 340, 452, 548, 565, 680, 685, 904, 1096, 1130, 1360, 1370, 1808, 1921, 2192, 2260, 2329, 2740, 3842, 4520, 4658, 5480, 7684, 9040, 9316, 9605, 10960, 11645, 15368, 15481, 18632, 19210, 23290, 30736, 30962, 37264, 38420, 46580, 61924, 76840, 77405, 93160, 123848, 153680, 154810, 186320, 247696, 263177, 309620, 526354, 619240, 1052708, 1238480, 1315885, 2105416, 2631770, 4210832, 5263540, 10527080, 21054160]

約数ペア:

[(1, 21054160), (2, 10527080), (4, 5263540), (5, 4210832), (8, 2631770), (10, 2105416), (16, 1315885), (17, 1238480), (20, 1052708), (34, 619240), (40, 526354), (68, 309620), (80, 263177), (85, 247696), (113, 186320), (136, 154810), (137, 153680), (170, 123848), (226, 93160), (272, 77405), (274, 76840), (340, 61924), (452, 46580), (548, 38420), (565, 37264), (680, 30962), (685, 30736), (904, 23290), (1096, 19210), (1130, 18632), (1360, 15481), (1370, 15368), (1808, 11645), (1921, 10960), (2192, 9605), (2260, 9316), (2329, 9040), (2740, 7684), (3842, 5480), (4520, 4658)]