28266520

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{269}}^1$

素因数の和:388

約数の個数: 64

約数和(自身を含む): 66484800

約数和(自身を除く): 38218280

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 71, 74, 142, 148, 185, 269, 284, 296, 355, 370, 538, 568, 710, 740, 1076, 1345, 1420, 1480, 2152, 2627, 2690, 2840, 5254, 5380, 9953, 10508, 10760, 13135, 19099, 19906, 21016, 26270, 38198, 39812, 49765, 52540, 76396, 79624, 95495, 99530, 105080, 152792, 190990, 199060, 381980, 398120, 706663, 763960, 1413326, 2826652, 3533315, 5653304, 7066630, 14133260, 28266520]

約数ペア:

[(1, 28266520), (2, 14133260), (4, 7066630), (5, 5653304), (8, 3533315), (10, 2826652), (20, 1413326), (37, 763960), (40, 706663), (71, 398120), (74, 381980), (142, 199060), (148, 190990), (185, 152792), (269, 105080), (284, 99530), (296, 95495), (355, 79624), (370, 76396), (538, 52540), (568, 49765), (710, 39812), (740, 38198), (1076, 26270), (1345, 21016), (1420, 19906), (1480, 19099), (2152, 13135), (2627, 10760), (2690, 10508), (2840, 9953), (5254, 5380)]