21293965

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:154

約数の個数: 64

約数和(自身を含む): 34836480

約数和(自身を除く): 13542515

約数列:

[1, 5, 7, 11, 19, 35, 41, 55, 71, 77, 95, 133, 205, 209, 287, 355, 385, 451, 497, 665, 779, 781, 1045, 1349, 1435, 1463, 2255, 2485, 2911, 3157, 3895, 3905, 5453, 5467, 6745, 7315, 8569, 9443, 14555, 14839, 15785, 20377, 27265, 27335, 32021, 42845, 47215, 55309, 59983, 74195, 101885, 103873, 160105, 224147, 276545, 299915, 387163, 519365, 608399, 1120735, 1935815, 3041995, 4258793, 21293965]

約数ペア:

[(1, 21293965), (5, 4258793), (7, 3041995), (11, 1935815), (19, 1120735), (35, 608399), (41, 519365), (55, 387163), (71, 299915), (77, 276545), (95, 224147), (133, 160105), (205, 103873), (209, 101885), (287, 74195), (355, 59983), (385, 55309), (451, 47215), (497, 42845), (665, 32021), (779, 27335), (781, 27265), (1045, 20377), (1349, 15785), (1435, 14839), (1463, 14555), (2255, 9443), (2485, 8569), (2911, 7315), (3157, 6745), (3895, 5467), (3905, 5453)]