21220715

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{1109}}^1$

素因数の和:1246

約数の個数: 16

約数和(自身を含む): 26373600

約数和(自身を除く): 5152885

約数列:

[1, 5, 43, 89, 215, 445, 1109, 3827, 5545, 19135, 47687, 98701, 238435, 493505, 4244143, 21220715]

約数ペア:

[(1, 21220715), (5, 4244143), (43, 493505), (89, 238435), (215, 98701), (445, 47687), (1109, 19135), (3827, 5545)]