20970775

素因数分解:

$5^2\times 7^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1$

素因数の和:113

約数の個数: 72

約数和(自身を含む): 34350480

約数和(自身を除く): 13379705

約数列:

[1, 5, 7, 17, 19, 25, 35, 49, 53, 85, 95, 119, 133, 175, 245, 265, 323, 371, 425, 475, 595, 665, 833, 901, 931, 1007, 1225, 1325, 1615, 1855, 2261, 2597, 2975, 3325, 4165, 4505, 4655, 5035, 6307, 7049, 8075, 9275, 11305, 12985, 15827, 17119, 20825, 22525, 23275, 25175, 31535, 35245, 44149, 49343, 56525, 64925, 79135, 85595, 119833, 157675, 176225, 220745, 246715, 395675, 427975, 599165, 838831, 1103725, 1233575, 2995825, 4194155, 20970775]

約数ペア:

[(1, 20970775), (5, 4194155), (7, 2995825), (17, 1233575), (19, 1103725), (25, 838831), (35, 599165), (49, 427975), (53, 395675), (85, 246715), (95, 220745), (119, 176225), (133, 157675), (175, 119833), (245, 85595), (265, 79135), (323, 64925), (371, 56525), (425, 49343), (475, 44149), (595, 35245), (665, 31535), (833, 25175), (901, 23275), (931, 22525), (1007, 20825), (1225, 17119), (1325, 15827), (1615, 12985), (1855, 11305), (2261, 9275), (2597, 8075), (2975, 7049), (3325, 6307), (4165, 5035), (4505, 4655)]