20691855

素因数分解:

$3^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{2689}}^1$

素因数の和:2725

約数の個数: 40

約数和(自身を含む): 39058800

約数和(自身を除く): 18366945

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 81, 95, 135, 171, 285, 405, 513, 855, 1539, 2565, 2689, 7695, 8067, 13445, 24201, 40335, 51091, 72603, 121005, 153273, 217809, 255455, 363015, 459819, 766365, 1089045, 1379457, 2299095, 4138371, 6897285, 20691855]

約数ペア:

[(1, 20691855), (3, 6897285), (5, 4138371), (9, 2299095), (15, 1379457), (19, 1089045), (27, 766365), (45, 459819), (57, 363015), (81, 255455), (95, 217809), (135, 153273), (171, 121005), (285, 72603), (405, 51091), (513, 40335), (855, 24201), (1539, 13445), (2565, 8067), (2689, 7695)]