21203445

素因数分解:

$3^1\times 5^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1\times {\mathrm{179}}^1$

素因数の和:389

約数の個数: 32

約数和(自身を含む): 34992000

約数和(自身を除く): 13788555

約数列:

[1, 3, 5, 15, 53, 149, 159, 179, 265, 447, 537, 745, 795, 895, 2235, 2685, 7897, 9487, 23691, 26671, 28461, 39485, 47435, 80013, 118455, 133355, 142305, 400065, 1413563, 4240689, 7067815, 21203445]

約数ペア:

[(1, 21203445), (3, 7067815), (5, 4240689), (15, 1413563), (53, 400065), (149, 142305), (159, 133355), (179, 118455), (265, 80013), (447, 47435), (537, 39485), (745, 28461), (795, 26671), (895, 23691), (2235, 9487), (2685, 7897)]