21111225

素因数分解:

$3^1\times 5^2\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{113}}^1$

素因数の和:226

約数の個数: 48

約数和(自身を含む): 36640512

約数和(自身を除く): 15529287

約数列:

[1, 3, 5, 15, 25, 47, 53, 75, 113, 141, 159, 235, 265, 339, 565, 705, 795, 1175, 1325, 1695, 2491, 2825, 3525, 3975, 5311, 5989, 7473, 8475, 12455, 15933, 17967, 26555, 29945, 37365, 62275, 79665, 89835, 132775, 149725, 186825, 281483, 398325, 449175, 844449, 1407415, 4222245, 7037075, 21111225]

約数ペア:

[(1, 21111225), (3, 7037075), (5, 4222245), (15, 1407415), (25, 844449), (47, 449175), (53, 398325), (75, 281483), (113, 186825), (141, 149725), (159, 132775), (235, 89835), (265, 79665), (339, 62275), (565, 37365), (705, 29945), (795, 26555), (1175, 17967), (1325, 15933), (1695, 12455), (2491, 8475), (2825, 7473), (3525, 5989), (3975, 5311)]