21895280

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{179}}^1$

素因数の和:342

約数の個数: 80

約数和(自身を含む): 56246400

約数和(自身を除く): 34351120

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 139, 176, 179, 220, 278, 358, 440, 556, 695, 716, 880, 895, 1112, 1390, 1432, 1529, 1790, 1969, 2224, 2780, 2864, 3058, 3580, 3938, 5560, 6116, 7160, 7645, 7876, 9845, 11120, 12232, 14320, 15290, 15752, 19690, 24464, 24881, 30580, 31504, 39380, 49762, 61160, 78760, 99524, 122320, 124405, 157520, 199048, 248810, 273691, 398096, 497620, 547382, 995240, 1094764, 1368455, 1990480, 2189528, 2736910, 4379056, 5473820, 10947640, 21895280]

約数ペア:

[(1, 21895280), (2, 10947640), (4, 5473820), (5, 4379056), (8, 2736910), (10, 2189528), (11, 1990480), (16, 1368455), (20, 1094764), (22, 995240), (40, 547382), (44, 497620), (55, 398096), (80, 273691), (88, 248810), (110, 199048), (139, 157520), (176, 124405), (179, 122320), (220, 99524), (278, 78760), (358, 61160), (440, 49762), (556, 39380), (695, 31504), (716, 30580), (880, 24881), (895, 24464), (1112, 19690), (1390, 15752), (1432, 15290), (1529, 14320), (1790, 12232), (1969, 11120), (2224, 9845), (2780, 7876), (2864, 7645), (3058, 7160), (3580, 6116), (3938, 5560)]