20987000

素因数分解:

$2^3\times 5^3\times {\mathrm{31}}^1\times {\mathrm{677}}^1$

素因数の和:729

約数の個数: 64

約数和(自身を含む): 50768640

約数和(自身を除く): 29781640

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 31, 40, 50, 62, 100, 124, 125, 155, 200, 248, 250, 310, 500, 620, 677, 775, 1000, 1240, 1354, 1550, 2708, 3100, 3385, 3875, 5416, 6200, 6770, 7750, 13540, 15500, 16925, 20987, 27080, 31000, 33850, 41974, 67700, 83948, 84625, 104935, 135400, 167896, 169250, 209870, 338500, 419740, 524675, 677000, 839480, 1049350, 2098700, 2623375, 4197400, 5246750, 10493500, 20987000]

約数ペア:

[(1, 20987000), (2, 10493500), (4, 5246750), (5, 4197400), (8, 2623375), (10, 2098700), (20, 1049350), (25, 839480), (31, 677000), (40, 524675), (50, 419740), (62, 338500), (100, 209870), (124, 169250), (125, 167896), (155, 135400), (200, 104935), (248, 84625), (250, 83948), (310, 67700), (500, 41974), (620, 33850), (677, 31000), (775, 27080), (1000, 20987), (1240, 16925), (1354, 15500), (1550, 13540), (2708, 7750), (3100, 6770), (3385, 6200), (3875, 5416)]