20909180

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{593}}^1$

素因数の和:686

約数の個数: 48

約数和(自身を含む): 46103904

約数和(自身を除く): 25194724

約数列:

[1, 2, 4, 5, 10, 20, 41, 43, 82, 86, 164, 172, 205, 215, 410, 430, 593, 820, 860, 1186, 1763, 2372, 2965, 3526, 5930, 7052, 8815, 11860, 17630, 24313, 25499, 35260, 48626, 50998, 97252, 101996, 121565, 127495, 243130, 254990, 486260, 509980, 1045459, 2090918, 4181836, 5227295, 10454590, 20909180]

約数ペア:

[(1, 20909180), (2, 10454590), (4, 5227295), (5, 4181836), (10, 2090918), (20, 1045459), (41, 509980), (43, 486260), (82, 254990), (86, 243130), (164, 127495), (172, 121565), (205, 101996), (215, 97252), (410, 50998), (430, 48626), (593, 35260), (820, 25499), (860, 24313), (1186, 17630), (1763, 11860), (2372, 8815), (2965, 7052), (3526, 5930)]