81789775

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{409}}^1\times {\mathrm{421}}^1$

素因数の和:859

約数の個数: 24

約数和(自身を含む): 107272400

約数和(自身を除く): 25482625

約数列:

[1, 5, 19, 25, 95, 409, 421, 475, 2045, 2105, 7771, 7999, 10225, 10525, 38855, 39995, 172189, 194275, 199975, 860945, 3271591, 4304725, 16357955, 81789775]

約数ペア:

[(1, 81789775), (5, 16357955), (19, 4304725), (25, 3271591), (95, 860945), (409, 199975), (421, 194275), (475, 172189), (2045, 39995), (2105, 38855), (7771, 10525), (7999, 10225)]