28381820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{3931}}^1$

素因数の和:3978

約数の個数: 36

約数和(自身を含む): 62919864

約数和(自身を除く): 34538044

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 361, 380, 722, 1444, 1805, 3610, 3931, 7220, 7862, 15724, 19655, 39310, 74689, 78620, 149378, 298756, 373445, 746890, 1419091, 1493780, 2838182, 5676364, 7095455, 14190910, 28381820]

約数ペア:

[(1, 28381820), (2, 14190910), (4, 7095455), (5, 5676364), (10, 2838182), (19, 1493780), (20, 1419091), (38, 746890), (76, 373445), (95, 298756), (190, 149378), (361, 78620), (380, 74689), (722, 39310), (1444, 19655), (1805, 15724), (3610, 7862), (3931, 7220)]