21808556

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{41}}^1\times {\mathrm{157}}^1$

素因数の和:231

約数の個数: 72

約数和(自身を含む): 49424928

約数和(自身を除く): 27616372

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 41, 44, 77, 82, 121, 154, 157, 164, 242, 287, 308, 314, 451, 484, 574, 628, 847, 902, 1099, 1148, 1694, 1727, 1804, 2198, 3157, 3388, 3454, 4396, 4961, 6314, 6437, 6908, 9922, 12089, 12628, 12874, 18997, 19844, 24178, 25748, 34727, 37994, 45059, 48356, 69454, 70807, 75988, 90118, 132979, 138908, 141614, 180236, 265958, 283228, 495649, 531916, 778877, 991298, 1557754, 1982596, 3115508, 5452139, 10904278, 21808556]

約数ペア:

[(1, 21808556), (2, 10904278), (4, 5452139), (7, 3115508), (11, 1982596), (14, 1557754), (22, 991298), (28, 778877), (41, 531916), (44, 495649), (77, 283228), (82, 265958), (121, 180236), (154, 141614), (157, 138908), (164, 132979), (242, 90118), (287, 75988), (308, 70807), (314, 69454), (451, 48356), (484, 45059), (574, 37994), (628, 34727), (847, 25748), (902, 24178), (1099, 19844), (1148, 18997), (1694, 12874), (1727, 12628), (1804, 12089), (2198, 9922), (3157, 6908), (3388, 6437), (3454, 6314), (4396, 4961)]