21315931

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{307}}^1$

素因数の和:443

約数の個数: 24

約数和(自身を含む): 27036240

約数和(自身を除く): 5720309

約数列:

[1, 7, 13, 49, 91, 109, 307, 637, 763, 1417, 2149, 3991, 5341, 9919, 15043, 27937, 33463, 69433, 195559, 234241, 435019, 1639687, 3045133, 21315931]

約数ペア:

[(1, 21315931), (7, 3045133), (13, 1639687), (49, 435019), (91, 234241), (109, 195559), (307, 69433), (637, 33463), (763, 27937), (1417, 15043), (2149, 9919), (3991, 5341)]