20904880

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{103}}^1$

素因数の和:218

約数の個数: 80

約数和(自身を含む): 51068160

約数和(自身を除く): 30163280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 59, 80, 86, 103, 118, 172, 206, 215, 236, 295, 344, 412, 430, 472, 515, 590, 688, 824, 860, 944, 1030, 1180, 1648, 1720, 2060, 2360, 2537, 3440, 4120, 4429, 4720, 5074, 6077, 8240, 8858, 10148, 12154, 12685, 17716, 20296, 22145, 24308, 25370, 30385, 35432, 40592, 44290, 48616, 50740, 60770, 70864, 88580, 97232, 101480, 121540, 177160, 202960, 243080, 261311, 354320, 486160, 522622, 1045244, 1306555, 2090488, 2613110, 4180976, 5226220, 10452440, 20904880]

約数ペア:

[(1, 20904880), (2, 10452440), (4, 5226220), (5, 4180976), (8, 2613110), (10, 2090488), (16, 1306555), (20, 1045244), (40, 522622), (43, 486160), (59, 354320), (80, 261311), (86, 243080), (103, 202960), (118, 177160), (172, 121540), (206, 101480), (215, 97232), (236, 88580), (295, 70864), (344, 60770), (412, 50740), (430, 48616), (472, 44290), (515, 40592), (590, 35432), (688, 30385), (824, 25370), (860, 24308), (944, 22145), (1030, 20296), (1180, 17716), (1648, 12685), (1720, 12154), (2060, 10148), (2360, 8858), (2537, 8240), (3440, 6077), (4120, 5074), (4429, 4720)]