21378439

素因数分解:

${\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{137}}^1\times {\mathrm{191}}^1$

素因数の和:390

約数の個数: 16

約数和(自身を含む): 23316480

約数和(自身を除く): 1938041

約数列:

[1, 19, 43, 137, 191, 817, 2603, 3629, 5891, 8213, 26167, 111929, 156047, 497173, 1125181, 21378439]

約数ペア:

[(1, 21378439), (19, 1125181), (43, 497173), (137, 156047), (191, 111929), (817, 26167), (2603, 8213), (3629, 5891)]