19994780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1451}}^1$

素因数の和:1526

約数の個数: 48

約数和(自身を含む): 46103904

約数和(自身を除く): 26109124

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1451, 2756, 2902, 3445, 5804, 6890, 7255, 13780, 14510, 18863, 29020, 37726, 75452, 76903, 94315, 153806, 188630, 307612, 377260, 384515, 769030, 999739, 1538060, 1999478, 3998956, 4998695, 9997390, 19994780]

約数ペア:

[(1, 19994780), (2, 9997390), (4, 4998695), (5, 3998956), (10, 1999478), (13, 1538060), (20, 999739), (26, 769030), (52, 384515), (53, 377260), (65, 307612), (106, 188630), (130, 153806), (212, 94315), (260, 76903), (265, 75452), (530, 37726), (689, 29020), (1060, 18863), (1378, 14510), (1451, 13780), (2756, 7255), (2902, 6890), (3445, 5804)]