21009725

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{4021}}^1$

素因数の和:4061

約数の個数: 24

約数和(自身を含む): 29923680

約数和(自身を除く): 8913955

約数列:

[1, 5, 11, 19, 25, 55, 95, 209, 275, 475, 1045, 4021, 5225, 20105, 44231, 76399, 100525, 221155, 381995, 840389, 1105775, 1909975, 4201945, 21009725]

約数ペア:

[(1, 21009725), (5, 4201945), (11, 1909975), (19, 1105775), (25, 840389), (55, 381995), (95, 221155), (209, 100525), (275, 76399), (475, 44231), (1045, 20105), (4021, 5225)]