20489720

素因数分解:

$2^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{3739}}^1$

素因数の和:3887

約数の個数: 32

約数和(自身を含む): 46450800

約数和(自身を除く): 25961080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 137, 274, 548, 685, 1096, 1370, 2740, 3739, 5480, 7478, 14956, 18695, 29912, 37390, 74780, 149560, 512243, 1024486, 2048972, 2561215, 4097944, 5122430, 10244860, 20489720]

約数ペア:

[(1, 20489720), (2, 10244860), (4, 5122430), (5, 4097944), (8, 2561215), (10, 2048972), (20, 1024486), (40, 512243), (137, 149560), (274, 74780), (548, 37390), (685, 29912), (1096, 18695), (1370, 14956), (2740, 7478), (3739, 5480)]