20990440

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{389}}^1$

素因数の和:490

約数の個数: 64

約数和(自身を含む): 50544000

約数和(自身を除く): 29553560

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 71, 76, 95, 142, 152, 190, 284, 355, 380, 389, 568, 710, 760, 778, 1349, 1420, 1556, 1945, 2698, 2840, 3112, 3890, 5396, 6745, 7391, 7780, 10792, 13490, 14782, 15560, 26980, 27619, 29564, 36955, 53960, 55238, 59128, 73910, 110476, 138095, 147820, 220952, 276190, 295640, 524761, 552380, 1049522, 1104760, 2099044, 2623805, 4198088, 5247610, 10495220, 20990440]

約数ペア:

[(1, 20990440), (2, 10495220), (4, 5247610), (5, 4198088), (8, 2623805), (10, 2099044), (19, 1104760), (20, 1049522), (38, 552380), (40, 524761), (71, 295640), (76, 276190), (95, 220952), (142, 147820), (152, 138095), (190, 110476), (284, 73910), (355, 59128), (380, 55238), (389, 53960), (568, 36955), (710, 29564), (760, 27619), (778, 26980), (1349, 15560), (1420, 14782), (1556, 13490), (1945, 10792), (2698, 7780), (2840, 7391), (3112, 6745), (3890, 5396)]