21603855

素因数分解:

$3^1\times 5^1\times 7^3\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1$

素因数の和:78

約数の個数: 128

約数和(自身を含む): 48384000

約数和(自身を除く): 26780145

約数列:

[1, 3, 5, 7, 13, 15, 17, 19, 21, 35, 39, 49, 51, 57, 65, 85, 91, 95, 105, 119, 133, 147, 195, 221, 245, 247, 255, 273, 285, 323, 343, 357, 399, 455, 595, 637, 663, 665, 735, 741, 833, 931, 969, 1029, 1105, 1235, 1365, 1547, 1615, 1715, 1729, 1785, 1911, 1995, 2261, 2499, 2793, 3185, 3315, 3705, 4165, 4199, 4459, 4641, 4655, 4845, 5145, 5187, 5831, 6517, 6783, 7735, 8645, 9555, 10829, 11305, 12103, 12495, 12597, 13377, 13965, 15827, 17493, 19551, 20995, 22295, 23205, 25935, 29155, 29393, 32487, 32585, 33915, 36309, 47481, 54145, 60515, 62985, 66885, 75803, 79135, 84721, 87465, 88179, 97755, 110789, 146965, 162435, 181545, 205751, 227409, 237405, 254163, 332367, 379015, 423605, 440895, 553945, 617253, 1028755, 1137045, 1270815, 1440257, 1661835, 3086265, 4320771, 7201285, 21603855]

約数ペア:

[(1, 21603855), (3, 7201285), (5, 4320771), (7, 3086265), (13, 1661835), (15, 1440257), (17, 1270815), (19, 1137045), (21, 1028755), (35, 617253), (39, 553945), (49, 440895), (51, 423605), (57, 379015), (65, 332367), (85, 254163), (91, 237405), (95, 227409), (105, 205751), (119, 181545), (133, 162435), (147, 146965), (195, 110789), (221, 97755), (245, 88179), (247, 87465), (255, 84721), (273, 79135), (285, 75803), (323, 66885), (343, 62985), (357, 60515), (399, 54145), (455, 47481), (595, 36309), (637, 33915), (663, 32585), (665, 32487), (735, 29393), (741, 29155), (833, 25935), (931, 23205), (969, 22295), (1029, 20995), (1105, 19551), (1235, 17493), (1365, 15827), (1547, 13965), (1615, 13377), (1715, 12597), (1729, 12495), (1785, 12103), (1911, 11305), (1995, 10829), (2261, 9555), (2499, 8645), (2793, 7735), (3185, 6783), (3315, 6517), (3705, 5831), (4165, 5187), (4199, 5145), (4459, 4845), (4641, 4655)]