21054075

素因数分解:

$3^1\times 5^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{337}}^1$

素因数の和:381

約数の個数: 72

約数和(自身を含む): 43001712

約数和(自身を除く): 21947637

約数列:

[1, 3, 5, 7, 15, 17, 21, 25, 35, 49, 51, 75, 85, 105, 119, 147, 175, 245, 255, 337, 357, 425, 525, 595, 735, 833, 1011, 1225, 1275, 1685, 1785, 2359, 2499, 2975, 3675, 4165, 5055, 5729, 7077, 8425, 8925, 11795, 12495, 16513, 17187, 20825, 25275, 28645, 35385, 40103, 49539, 58975, 62475, 82565, 85935, 120309, 143225, 176925, 200515, 247695, 280721, 412825, 429675, 601545, 842163, 1002575, 1238475, 1403605, 3007725, 4210815, 7018025, 21054075]

約数ペア:

[(1, 21054075), (3, 7018025), (5, 4210815), (7, 3007725), (15, 1403605), (17, 1238475), (21, 1002575), (25, 842163), (35, 601545), (49, 429675), (51, 412825), (75, 280721), (85, 247695), (105, 200515), (119, 176925), (147, 143225), (175, 120309), (245, 85935), (255, 82565), (337, 62475), (357, 58975), (425, 49539), (525, 40103), (595, 35385), (735, 28645), (833, 25275), (1011, 20825), (1225, 17187), (1275, 16513), (1685, 12495), (1785, 11795), (2359, 8925), (2499, 8425), (2975, 7077), (3675, 5729), (4165, 5055)]