19901765

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^2\times {\mathrm{109}}^1$

素因数の和:233

約数の個数: 24

約数和(自身を含む): 26454120

約数和(自身を除く): 6552355

約数列:

[1, 5, 13, 53, 65, 109, 265, 545, 689, 1417, 2809, 3445, 5777, 7085, 14045, 28885, 36517, 75101, 182585, 306181, 375505, 1530905, 3980353, 19901765]

約数ペア:

[(1, 19901765), (5, 3980353), (13, 1530905), (53, 375505), (65, 306181), (109, 182585), (265, 75101), (545, 36517), (689, 28885), (1417, 14045), (2809, 7085), (3445, 5777)]