21717969

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{79}}^1$

素因数の和:174

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 16989231

約数列:

[1, 3, 7, 13, 19, 21, 39, 53, 57, 79, 91, 133, 159, 237, 247, 273, 371, 399, 553, 689, 741, 1007, 1027, 1113, 1501, 1659, 1729, 2067, 3021, 3081, 4187, 4503, 4823, 5187, 7049, 7189, 10507, 12561, 13091, 14469, 19513, 21147, 21567, 29309, 31521, 39273, 54431, 58539, 79553, 87927, 91637, 136591, 163293, 238659, 274911, 381017, 409773, 556871, 1034189, 1143051, 1670613, 3102567, 7239323, 21717969]

約数ペア:

[(1, 21717969), (3, 7239323), (7, 3102567), (13, 1670613), (19, 1143051), (21, 1034189), (39, 556871), (53, 409773), (57, 381017), (79, 274911), (91, 238659), (133, 163293), (159, 136591), (237, 91637), (247, 87927), (273, 79553), (371, 58539), (399, 54431), (553, 39273), (689, 31521), (741, 29309), (1007, 21567), (1027, 21147), (1113, 19513), (1501, 14469), (1659, 13091), (1729, 12561), (2067, 10507), (3021, 7189), (3081, 7049), (4187, 5187), (4503, 4823)]