21021325

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{911}}^1$

素因数の和:1005

約数の個数: 24

約数和(自身を含む): 28498176

約数和(自身を除く): 7476851

約数列:

[1, 5, 13, 25, 65, 71, 325, 355, 911, 923, 1775, 4555, 4615, 11843, 22775, 23075, 59215, 64681, 296075, 323405, 840853, 1617025, 4204265, 21021325]

約数ペア:

[(1, 21021325), (5, 4204265), (13, 1617025), (25, 840853), (65, 323405), (71, 296075), (325, 64681), (355, 59215), (911, 23075), (923, 22775), (1775, 11843), (4555, 4615)]