21021

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1$

素因数の和:41

約数の個数: 24

約数和(自身を含む): 38304

約数和(自身を除く): 17283

約数列:

[1, 3, 7, 11, 13, 21, 33, 39, 49, 77, 91, 143, 147, 231, 273, 429, 539, 637, 1001, 1617, 1911, 3003, 7007, 21021]

約数ペア:

[(1, 21021), (3, 7007), (7, 3003), (11, 1911), (13, 1617), (21, 1001), (33, 637), (39, 539), (49, 429), (77, 273), (91, 231), (143, 147)]