20406855

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{193}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 40227840

約数和(自身を除く): 19820985

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 53, 57, 95, 105, 133, 159, 193, 265, 285, 371, 399, 579, 665, 795, 965, 1007, 1113, 1351, 1855, 1995, 2895, 3021, 3667, 4053, 5035, 5565, 6755, 7049, 10229, 11001, 15105, 18335, 20265, 21147, 25669, 30687, 35245, 51145, 55005, 71603, 77007, 105735, 128345, 153435, 194351, 214809, 358015, 385035, 583053, 971755, 1074045, 1360457, 2915265, 4081371, 6802285, 20406855]

約数ペア:

[(1, 20406855), (3, 6802285), (5, 4081371), (7, 2915265), (15, 1360457), (19, 1074045), (21, 971755), (35, 583053), (53, 385035), (57, 358015), (95, 214809), (105, 194351), (133, 153435), (159, 128345), (193, 105735), (265, 77007), (285, 71603), (371, 55005), (399, 51145), (579, 35245), (665, 30687), (795, 25669), (965, 21147), (1007, 20265), (1113, 18335), (1351, 15105), (1855, 11001), (1995, 10229), (2895, 7049), (3021, 6755), (3667, 5565), (4053, 5035)]