21749205

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^2$

素因数の和:178

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 17623275

約数列:

[1, 3, 5, 15, 17, 19, 51, 57, 67, 85, 95, 201, 255, 285, 323, 335, 969, 1005, 1139, 1273, 1615, 3417, 3819, 4489, 4845, 5695, 6365, 13467, 17085, 19095, 21641, 22445, 64923, 67335, 76313, 85291, 108205, 228939, 255873, 324615, 381565, 426455, 1144695, 1279365, 1449947, 4349841, 7249735, 21749205]

約数ペア:

[(1, 21749205), (3, 7249735), (5, 4349841), (15, 1449947), (17, 1279365), (19, 1144695), (51, 426455), (57, 381565), (67, 324615), (85, 255873), (95, 228939), (201, 108205), (255, 85291), (285, 76313), (323, 67335), (335, 64923), (969, 22445), (1005, 21641), (1139, 19095), (1273, 17085), (1615, 13467), (3417, 6365), (3819, 5695), (4489, 4845)]