19209905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{401}}^1$

素因数の和:497

約数の個数: 32

約数和(自身を含む): 27554688

約数和(自身を除く): 8344783

約数列:

[1, 5, 11, 13, 55, 65, 67, 143, 335, 401, 715, 737, 871, 2005, 3685, 4355, 4411, 5213, 9581, 22055, 26065, 26867, 47905, 57343, 134335, 286715, 295537, 349271, 1477685, 1746355, 3841981, 19209905]

約数ペア:

[(1, 19209905), (5, 3841981), (11, 1746355), (13, 1477685), (55, 349271), (65, 295537), (67, 286715), (143, 134335), (335, 57343), (401, 47905), (715, 26867), (737, 26065), (871, 22055), (2005, 9581), (3685, 5213), (4355, 4411)]