21253281

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{1609}}^1$

素因数の和:1673

約数の個数: 32

約数和(自身を含む): 35239680

約数和(自身を除く): 13986399

約数列:

[1, 3, 7, 17, 21, 37, 51, 111, 119, 259, 357, 629, 777, 1609, 1887, 4403, 4827, 11263, 13209, 27353, 33789, 59533, 82059, 178599, 191471, 416731, 574413, 1012061, 1250193, 3036183, 7084427, 21253281]

約数ペア:

[(1, 21253281), (3, 7084427), (7, 3036183), (17, 1250193), (21, 1012061), (37, 574413), (51, 416731), (111, 191471), (119, 178599), (259, 82059), (357, 59533), (629, 33789), (777, 27353), (1609, 13209), (1887, 11263), (4403, 4827)]