20981519

素因数分解:

${\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{109}}^1$

素因数の和:219

約数の個数: 24

約数和(自身を含む): 24639120

約数和(自身を除く): 3657601

約数列:

[1, 13, 17, 67, 109, 169, 221, 871, 1139, 1417, 1853, 2873, 7303, 11323, 14807, 18421, 24089, 94939, 124151, 192491, 313157, 1234207, 1613963, 20981519]

約数ペア:

[(1, 20981519), (13, 1613963), (17, 1234207), (67, 313157), (109, 192491), (169, 124151), (221, 94939), (871, 24089), (1139, 18421), (1417, 14807), (1853, 11323), (2873, 7303)]