19890740

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{127}}^1\times {\mathrm{191}}^1$

素因数の和:368

約数の個数: 48

約数和(自身を含む): 43352064

約数和(自身を除く): 23461324

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 127, 164, 191, 205, 254, 382, 410, 508, 635, 764, 820, 955, 1270, 1910, 2540, 3820, 5207, 7831, 10414, 15662, 20828, 24257, 26035, 31324, 39155, 48514, 52070, 78310, 97028, 104140, 121285, 156620, 242570, 485140, 994537, 1989074, 3978148, 4972685, 9945370, 19890740]

約数ペア:

[(1, 19890740), (2, 9945370), (4, 4972685), (5, 3978148), (10, 1989074), (20, 994537), (41, 485140), (82, 242570), (127, 156620), (164, 121285), (191, 104140), (205, 97028), (254, 78310), (382, 52070), (410, 48514), (508, 39155), (635, 31324), (764, 26035), (820, 24257), (955, 20828), (1270, 15662), (1910, 10414), (2540, 7831), (3820, 5207)]