21397815

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{337}}^1$

素因数の和:448

約数の個数: 48

約数和(自身を含む): 39862368

約数和(自身を除く): 18464553

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 83, 85, 153, 249, 255, 337, 415, 747, 765, 1011, 1245, 1411, 1685, 3033, 3735, 4233, 5055, 5729, 7055, 12699, 15165, 17187, 21165, 27971, 28645, 51561, 63495, 83913, 85935, 139855, 251739, 257805, 419565, 475507, 1258695, 1426521, 2377535, 4279563, 7132605, 21397815]

約数ペア:

[(1, 21397815), (3, 7132605), (5, 4279563), (9, 2377535), (15, 1426521), (17, 1258695), (45, 475507), (51, 419565), (83, 257805), (85, 251739), (153, 139855), (249, 85935), (255, 83913), (337, 63495), (415, 51561), (747, 28645), (765, 27971), (1011, 21165), (1245, 17187), (1411, 15165), (1685, 12699), (3033, 7055), (3735, 5729), (4233, 5055)]