21338540

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{127}}^1\times {\mathrm{271}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 46792704

約数和(自身を除く): 25454164

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 127, 155, 254, 271, 310, 508, 542, 620, 635, 1084, 1270, 1355, 2540, 2710, 3937, 5420, 7874, 8401, 15748, 16802, 19685, 33604, 34417, 39370, 42005, 68834, 78740, 84010, 137668, 168020, 172085, 344170, 688340, 1066927, 2133854, 4267708, 5334635, 10669270, 21338540]

約数ペア:

[(1, 21338540), (2, 10669270), (4, 5334635), (5, 4267708), (10, 2133854), (20, 1066927), (31, 688340), (62, 344170), (124, 172085), (127, 168020), (155, 137668), (254, 84010), (271, 78740), (310, 68834), (508, 42005), (542, 39370), (620, 34417), (635, 33604), (1084, 19685), (1270, 16802), (1355, 15748), (2540, 8401), (2710, 7874), (3937, 5420)]