20308880

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{137}}^1$

素因数の和:276

約数の個数: 80

約数和(自身を含む): 50822640

約数和(自身を除く): 30513760

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 109, 136, 137, 170, 218, 272, 274, 340, 436, 545, 548, 680, 685, 872, 1090, 1096, 1360, 1370, 1744, 1853, 2180, 2192, 2329, 2740, 3706, 4360, 4658, 5480, 7412, 8720, 9265, 9316, 10960, 11645, 14824, 14933, 18530, 18632, 23290, 29648, 29866, 37060, 37264, 46580, 59732, 74120, 74665, 93160, 119464, 148240, 149330, 186320, 238928, 253861, 298660, 507722, 597320, 1015444, 1194640, 1269305, 2030888, 2538610, 4061776, 5077220, 10154440, 20308880]

約数ペア:

[(1, 20308880), (2, 10154440), (4, 5077220), (5, 4061776), (8, 2538610), (10, 2030888), (16, 1269305), (17, 1194640), (20, 1015444), (34, 597320), (40, 507722), (68, 298660), (80, 253861), (85, 238928), (109, 186320), (136, 149330), (137, 148240), (170, 119464), (218, 93160), (272, 74665), (274, 74120), (340, 59732), (436, 46580), (545, 37264), (548, 37060), (680, 29866), (685, 29648), (872, 23290), (1090, 18632), (1096, 18530), (1360, 14933), (1370, 14824), (1744, 11645), (1853, 10960), (2180, 9316), (2192, 9265), (2329, 8720), (2740, 7412), (3706, 5480), (4360, 4658)]