21085729

素因数分解:

$7^2\times {\mathrm{17}}^2\times {\mathrm{1489}}^1$

素因数の和:1537

約数の個数: 18

約数和(自身を含む): 26073510

約数和(自身を除く): 4987781

約数列:

[1, 7, 17, 49, 119, 289, 833, 1489, 2023, 10423, 14161, 25313, 72961, 177191, 430321, 1240337, 3012247, 21085729]

約数ペア:

[(1, 21085729), (7, 3012247), (17, 1240337), (49, 430321), (119, 177191), (289, 72961), (833, 25313), (1489, 14161), (2023, 10423)]