21708235

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{83}}^1\times {\mathrm{181}}^1$

素因数の和:303

約数の個数: 24

約数和(自身を含む): 28160496

約数和(自身を除く): 6452261

約数列:

[1, 5, 17, 83, 85, 181, 289, 415, 905, 1411, 1445, 3077, 7055, 15023, 15385, 23987, 52309, 75115, 119935, 255391, 261545, 1276955, 4341647, 21708235]

約数ペア:

[(1, 21708235), (5, 4341647), (17, 1276955), (83, 261545), (85, 255391), (181, 119935), (289, 75115), (415, 52309), (905, 23987), (1411, 15385), (1445, 15023), (3077, 7055)]