21151995

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{761}}^1$

素因数の和:895

約数の個数: 32

約数和(自身を含む): 36210240

約数和(自身を除く): 15058245

約数列:

[1, 3, 5, 15, 17, 51, 85, 109, 255, 327, 545, 761, 1635, 1853, 2283, 3805, 5559, 9265, 11415, 12937, 27795, 38811, 64685, 82949, 194055, 248847, 414745, 1244235, 1410133, 4230399, 7050665, 21151995]

約数ペア:

[(1, 21151995), (3, 7050665), (5, 4230399), (15, 1410133), (17, 1244235), (51, 414745), (85, 248847), (109, 194055), (255, 82949), (327, 64685), (545, 38811), (761, 27795), (1635, 12937), (1853, 11415), (2283, 9265), (3805, 5559)]