19978660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1787}}^1$

素因数の和:1852

約数の個数: 48

約数和(自身を含む): 46259136

約数和(自身を除く): 26280476

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 1787, 2236, 2795, 3574, 5590, 7148, 8935, 11180, 17870, 23231, 35740, 46462, 76841, 92924, 116155, 153682, 232310, 307364, 384205, 464620, 768410, 998933, 1536820, 1997866, 3995732, 4994665, 9989330, 19978660]

約数ペア:

[(1, 19978660), (2, 9989330), (4, 4994665), (5, 3995732), (10, 1997866), (13, 1536820), (20, 998933), (26, 768410), (43, 464620), (52, 384205), (65, 307364), (86, 232310), (130, 153682), (172, 116155), (215, 92924), (260, 76841), (430, 46462), (559, 35740), (860, 23231), (1118, 17870), (1787, 11180), (2236, 8935), (2795, 7148), (3574, 5590)]