21786723

素因数分解:

$3^2\times 7^2\times {\mathrm{127}}^1\times {\mathrm{389}}^1$

素因数の和:536

約数の個数: 36

約数和(自身を含む): 36990720

約数和(自身を除く): 15203997

約数列:

[1, 3, 7, 9, 21, 49, 63, 127, 147, 381, 389, 441, 889, 1143, 1167, 2667, 2723, 3501, 6223, 8001, 8169, 18669, 19061, 24507, 49403, 56007, 57183, 148209, 171549, 345821, 444627, 1037463, 2420747, 3112389, 7262241, 21786723]

約数ペア:

[(1, 21786723), (3, 7262241), (7, 3112389), (9, 2420747), (21, 1037463), (49, 444627), (63, 345821), (127, 171549), (147, 148209), (381, 57183), (389, 56007), (441, 49403), (889, 24507), (1143, 19061), (1167, 18669), (2667, 8169), (2723, 8001), (3501, 6223)]