21752140

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^2\times {\mathrm{647}}^1$

素因数の和:738

約数の個数: 36

約数和(自身を含む): 46893168

約数和(自身を除く): 25141028

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 647, 820, 1294, 1681, 2588, 3235, 3362, 6470, 6724, 8405, 12940, 16810, 26527, 33620, 53054, 106108, 132635, 265270, 530540, 1087607, 2175214, 4350428, 5438035, 10876070, 21752140]

約数ペア:

[(1, 21752140), (2, 10876070), (4, 5438035), (5, 4350428), (10, 2175214), (20, 1087607), (41, 530540), (82, 265270), (164, 132635), (205, 106108), (410, 53054), (647, 33620), (820, 26527), (1294, 16810), (1681, 12940), (2588, 8405), (3235, 6724), (3362, 6470)]