21215285

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{6661}}^1$

素因数の和:6693

約数の個数: 24

約数和(自身を含む): 31897656

約数和(自身を除く): 10682371

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 455, 637, 3185, 6661, 33305, 46627, 86593, 233135, 326389, 432965, 606151, 1631945, 3030755, 4243057, 21215285]

約数ペア:

[(1, 21215285), (5, 4243057), (7, 3030755), (13, 1631945), (35, 606151), (49, 432965), (65, 326389), (91, 233135), (245, 86593), (455, 46627), (637, 33305), (3185, 6661)]