20917565

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{97}}^1$

素因数の和:221

約数の個数: 32

約数和(自身を含む): 27941760

約数和(自身を除く): 7024195

約数列:

[1, 5, 17, 43, 59, 85, 97, 215, 295, 485, 731, 1003, 1649, 2537, 3655, 4171, 5015, 5723, 8245, 12685, 20855, 28615, 43129, 70907, 97291, 215645, 246089, 354535, 486455, 1230445, 4183513, 20917565]

約数ペア:

[(1, 20917565), (5, 4183513), (17, 1230445), (43, 486455), (59, 354535), (85, 246089), (97, 215645), (215, 97291), (295, 70907), (485, 43129), (731, 28615), (1003, 20855), (1649, 12685), (2537, 8245), (3655, 5723), (4171, 5015)]