21251475

素因数分解:

$3^2\times 5^2\times 7^1\times {\mathrm{103}}^1\times {\mathrm{131}}^1$

素因数の和:257

約数の個数: 72

約数和(自身を含む): 44259072

約数和(自身を除く): 23007597

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 35, 45, 63, 75, 103, 105, 131, 175, 225, 309, 315, 393, 515, 525, 655, 721, 917, 927, 1179, 1545, 1575, 1965, 2163, 2575, 2751, 3275, 3605, 4585, 4635, 5895, 6489, 7725, 8253, 9825, 10815, 13493, 13755, 18025, 22925, 23175, 29475, 32445, 40479, 41265, 54075, 67465, 68775, 94451, 121437, 162225, 202395, 206325, 283353, 337325, 472255, 607185, 850059, 1011975, 1416765, 2361275, 3035925, 4250295, 7083825, 21251475]

約数ペア:

[(1, 21251475), (3, 7083825), (5, 4250295), (7, 3035925), (9, 2361275), (15, 1416765), (21, 1011975), (25, 850059), (35, 607185), (45, 472255), (63, 337325), (75, 283353), (103, 206325), (105, 202395), (131, 162225), (175, 121437), (225, 94451), (309, 68775), (315, 67465), (393, 54075), (515, 41265), (525, 40479), (655, 32445), (721, 29475), (917, 23175), (927, 22925), (1179, 18025), (1545, 13755), (1575, 13493), (1965, 10815), (2163, 9825), (2575, 8253), (2751, 7725), (3275, 6489), (3605, 5895), (4585, 4635)]