21872081

素因数分解:

$7^3\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{31}}^1$

素因数の和:91

約数の個数: 48

約数和(自身を含む): 30643200

約数和(自身を除く): 8771119

約数列:

[1, 7, 11, 17, 31, 49, 77, 119, 121, 187, 217, 341, 343, 527, 539, 833, 847, 1309, 1519, 2057, 2387, 3689, 3751, 3773, 5797, 5831, 5929, 9163, 10633, 14399, 16709, 25823, 26257, 40579, 41503, 63767, 64141, 100793, 116963, 180761, 183799, 284053, 446369, 705551, 1286593, 1988371, 3124583, 21872081]

約数ペア:

[(1, 21872081), (7, 3124583), (11, 1988371), (17, 1286593), (31, 705551), (49, 446369), (77, 284053), (119, 183799), (121, 180761), (187, 116963), (217, 100793), (341, 64141), (343, 63767), (527, 41503), (539, 40579), (833, 26257), (847, 25823), (1309, 16709), (1519, 14399), (2057, 10633), (2387, 9163), (3689, 5929), (3751, 5831), (3773, 5797)]