20397910

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:193

約数の個数: 64

約数和(自身を含む): 41912640

約数和(自身を除く): 21514730

約数列:

[1, 2, 5, 10, 13, 26, 41, 43, 65, 82, 86, 89, 130, 178, 205, 215, 410, 430, 445, 533, 559, 890, 1066, 1118, 1157, 1763, 2314, 2665, 2795, 3526, 3649, 3827, 5330, 5590, 5785, 7298, 7654, 8815, 11570, 17630, 18245, 19135, 22919, 36490, 38270, 45838, 47437, 49751, 94874, 99502, 114595, 156907, 229190, 237185, 248755, 313814, 474370, 497510, 784535, 1569070, 2039791, 4079582, 10198955, 20397910]

約数ペア:

[(1, 20397910), (2, 10198955), (5, 4079582), (10, 2039791), (13, 1569070), (26, 784535), (41, 497510), (43, 474370), (65, 313814), (82, 248755), (86, 237185), (89, 229190), (130, 156907), (178, 114595), (205, 99502), (215, 94874), (410, 49751), (430, 47437), (445, 45838), (533, 38270), (559, 36490), (890, 22919), (1066, 19135), (1118, 18245), (1157, 17630), (1763, 11570), (2314, 8815), (2665, 7654), (2795, 7298), (3526, 5785), (3649, 5590), (3827, 5330)]