28921221

素因数分解:

$3^2\times 7^2\times {\mathrm{65581}}^1$

素因数の和:65601

約数の個数: 18

約数和(自身を含む): 48596262

約数和(自身を除く): 19675041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 65581, 196743, 459067, 590229, 1377201, 3213469, 4131603, 9640407, 28921221]

約数ペア:

[(1, 28921221), (3, 9640407), (7, 4131603), (9, 3213469), (21, 1377201), (49, 590229), (63, 459067), (147, 196743), (441, 65581)]