21280912

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{70003}}^1$

素因数の和:70030

約数の個数: 20

約数和(自身を含む): 43402480

約数和(自身を除く): 22121568

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 304, 70003, 140006, 280012, 560024, 1120048, 1330057, 2660114, 5320228, 10640456, 21280912]

約数ペア:

[(1, 21280912), (2, 10640456), (4, 5320228), (8, 2660114), (16, 1330057), (19, 1120048), (38, 560024), (76, 280012), (152, 140006), (304, 70003)]