21087355

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{191}}^1\times {\mathrm{311}}^1$

素因数の和:578

約数の個数: 16

約数和(自身を含む): 25878528

約数和(自身を除く): 4791173

約数列:

[1, 5, 71, 191, 311, 355, 955, 1555, 13561, 22081, 59401, 67805, 110405, 297005, 4217471, 21087355]

約数ペア:

[(1, 21087355), (5, 4217471), (71, 297005), (191, 110405), (311, 67805), (355, 59401), (955, 22081), (1555, 13561)]