19818520

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{293}}^1$

素因数の和:412

約数の個数: 64

約数和(自身を含む): 47628000

約数和(自身を除く): 27809480

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 89, 95, 152, 178, 190, 293, 356, 380, 445, 586, 712, 760, 890, 1172, 1465, 1691, 1780, 2344, 2930, 3382, 3560, 5567, 5860, 6764, 8455, 11134, 11720, 13528, 16910, 22268, 26077, 27835, 33820, 44536, 52154, 55670, 67640, 104308, 111340, 130385, 208616, 222680, 260770, 495463, 521540, 990926, 1043080, 1981852, 2477315, 3963704, 4954630, 9909260, 19818520]

約数ペア:

[(1, 19818520), (2, 9909260), (4, 4954630), (5, 3963704), (8, 2477315), (10, 1981852), (19, 1043080), (20, 990926), (38, 521540), (40, 495463), (76, 260770), (89, 222680), (95, 208616), (152, 130385), (178, 111340), (190, 104308), (293, 67640), (356, 55670), (380, 52154), (445, 44536), (586, 33820), (712, 27835), (760, 26077), (890, 22268), (1172, 16910), (1465, 13528), (1691, 11720), (1780, 11134), (2344, 8455), (2930, 6764), (3382, 5860), (3560, 5567)]