19986500

素因数分解:

$2^2\times 5^3\times {\mathrm{71}}^1\times {\mathrm{563}}^1$

素因数の和:653

約数の個数: 48

約数和(自身を含む): 44343936

約数和(自身を除く): 24357436

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 71, 100, 125, 142, 250, 284, 355, 500, 563, 710, 1126, 1420, 1775, 2252, 2815, 3550, 5630, 7100, 8875, 11260, 14075, 17750, 28150, 35500, 39973, 56300, 70375, 79946, 140750, 159892, 199865, 281500, 399730, 799460, 999325, 1998650, 3997300, 4996625, 9993250, 19986500]

約数ペア:

[(1, 19986500), (2, 9993250), (4, 4996625), (5, 3997300), (10, 1998650), (20, 999325), (25, 799460), (50, 399730), (71, 281500), (100, 199865), (125, 159892), (142, 140750), (250, 79946), (284, 70375), (355, 56300), (500, 39973), (563, 35500), (710, 28150), (1126, 17750), (1420, 14075), (1775, 11260), (2252, 8875), (2815, 7100), (3550, 5630)]