20897980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{137}}^1\times {\mathrm{263}}^1$

素因数の和:438

約数の個数: 48

約数和(自身を含む): 45904320

約数和(自身を除く): 25006340

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 137, 145, 263, 274, 290, 526, 548, 580, 685, 1052, 1315, 1370, 2630, 2740, 3973, 5260, 7627, 7946, 15254, 15892, 19865, 30508, 36031, 38135, 39730, 72062, 76270, 79460, 144124, 152540, 180155, 360310, 720620, 1044899, 2089798, 4179596, 5224495, 10448990, 20897980]

約数ペア:

[(1, 20897980), (2, 10448990), (4, 5224495), (5, 4179596), (10, 2089798), (20, 1044899), (29, 720620), (58, 360310), (116, 180155), (137, 152540), (145, 144124), (263, 79460), (274, 76270), (290, 72062), (526, 39730), (548, 38135), (580, 36031), (685, 30508), (1052, 19865), (1315, 15892), (1370, 15254), (2630, 7946), (2740, 7627), (3973, 5260)]