21605815

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{8017}}^1$

素因数の和:8047

約数の個数: 24

約数和(自身を含む): 32905872

約数和(自身を除く): 11300057

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 245, 385, 539, 2695, 8017, 40085, 56119, 88187, 280595, 392833, 440935, 617309, 1964165, 3086545, 4321163, 21605815]

約数ペア:

[(1, 21605815), (5, 4321163), (7, 3086545), (11, 1964165), (35, 617309), (49, 440935), (55, 392833), (77, 280595), (245, 88187), (385, 56119), (539, 40085), (2695, 8017)]