21791391

素因数分解:

$3^1\times {\mathrm{71}}^1\times {\mathrm{263}}^1\times {\mathrm{389}}^1$

素因数の和:726

約数の個数: 16

約数和(自身を含む): 29652480

約数和(自身を除く): 7861089

約数列:

[1, 3, 71, 213, 263, 389, 789, 1167, 18673, 27619, 56019, 82857, 102307, 306921, 7263797, 21791391]

約数ペア:

[(1, 21791391), (3, 7263797), (71, 306921), (213, 102307), (263, 82857), (389, 56019), (789, 27619), (1167, 18673)]