20173720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{661}}^1$

素因数の和:788

約数の個数: 64

約数和(自身を含む): 52430400

約数和(自身を除く): 32256680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 109, 140, 218, 280, 436, 545, 661, 763, 872, 1090, 1322, 1526, 2180, 2644, 3052, 3305, 3815, 4360, 4627, 5288, 6104, 6610, 7630, 9254, 13220, 15260, 18508, 23135, 26440, 30520, 37016, 46270, 72049, 92540, 144098, 185080, 288196, 360245, 504343, 576392, 720490, 1008686, 1440980, 2017372, 2521715, 2881960, 4034744, 5043430, 10086860, 20173720]

約数ペア:

[(1, 20173720), (2, 10086860), (4, 5043430), (5, 4034744), (7, 2881960), (8, 2521715), (10, 2017372), (14, 1440980), (20, 1008686), (28, 720490), (35, 576392), (40, 504343), (56, 360245), (70, 288196), (109, 185080), (140, 144098), (218, 92540), (280, 72049), (436, 46270), (545, 37016), (661, 30520), (763, 26440), (872, 23135), (1090, 18508), (1322, 15260), (1526, 13220), (2180, 9254), (2644, 7630), (3052, 6610), (3305, 6104), (3815, 5288), (4360, 4627)]