20561955

素因数分解:

$3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{449}}^1$

素因数の和:571

約数の個数: 32

約数和(自身を含む): 34214400

約数和(自身を除く): 13652445

約数列:

[1, 3, 5, 15, 43, 71, 129, 213, 215, 355, 449, 645, 1065, 1347, 2245, 3053, 6735, 9159, 15265, 19307, 31879, 45795, 57921, 95637, 96535, 159395, 289605, 478185, 1370797, 4112391, 6853985, 20561955]

約数ペア:

[(1, 20561955), (3, 6853985), (5, 4112391), (15, 1370797), (43, 478185), (71, 289605), (129, 159395), (213, 96535), (215, 95637), (355, 57921), (449, 45795), (645, 31879), (1065, 19307), (1347, 15265), (2245, 9159), (3053, 6735)]