20520400

素因数分解:

$2^4\times 5^2\times {\mathrm{29}}^2\times {\mathrm{61}}^1$

素因数の和:137

約数の個数: 90

約数和(自身を含む): 51895922

約数和(自身を除く): 31375522

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 29, 40, 50, 58, 61, 80, 100, 116, 122, 145, 200, 232, 244, 290, 305, 400, 464, 488, 580, 610, 725, 841, 976, 1160, 1220, 1450, 1525, 1682, 1769, 2320, 2440, 2900, 3050, 3364, 3538, 4205, 4880, 5800, 6100, 6728, 7076, 8410, 8845, 11600, 12200, 13456, 14152, 16820, 17690, 21025, 24400, 28304, 33640, 35380, 42050, 44225, 51301, 67280, 70760, 84100, 88450, 102602, 141520, 168200, 176900, 205204, 256505, 336400, 353800, 410408, 513010, 707600, 820816, 1026020, 1282525, 2052040, 2565050, 4104080, 5130100, 10260200, 20520400]

約数ペア:

[(1, 20520400), (2, 10260200), (4, 5130100), (5, 4104080), (8, 2565050), (10, 2052040), (16, 1282525), (20, 1026020), (25, 820816), (29, 707600), (40, 513010), (50, 410408), (58, 353800), (61, 336400), (80, 256505), (100, 205204), (116, 176900), (122, 168200), (145, 141520), (200, 102602), (232, 88450), (244, 84100), (290, 70760), (305, 67280), (400, 51301), (464, 44225), (488, 42050), (580, 35380), (610, 33640), (725, 28304), (841, 24400), (976, 21025), (1160, 17690), (1220, 16820), (1450, 14152), (1525, 13456), (1682, 12200), (1769, 11600), (2320, 8845), (2440, 8410), (2900, 7076), (3050, 6728), (3364, 6100), (3538, 5800), (4205, 4880)]