21278467

素因数分解:

$7^1\times {\mathrm{41}}^1\times {\mathrm{151}}^1\times {\mathrm{491}}^1$

素因数の和:690

約数の個数: 16

約数和(自身を含む): 25127424

約数和(自身を除く): 3848957

約数列:

[1, 7, 41, 151, 287, 491, 1057, 3437, 6191, 20131, 43337, 74141, 140917, 518987, 3039781, 21278467]

約数ペア:

[(1, 21278467), (7, 3039781), (41, 518987), (151, 140917), (287, 74141), (491, 43337), (1057, 20131), (3437, 6191)]