20689708

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{487}}^1$

素因数の和:566

約数の個数: 48

約数和(自身を含む): 42085120

約数和(自身を除く): 21395412

約数列:

[1, 2, 4, 13, 19, 26, 38, 43, 52, 76, 86, 172, 247, 487, 494, 559, 817, 974, 988, 1118, 1634, 1948, 2236, 3268, 6331, 9253, 10621, 12662, 18506, 20941, 21242, 25324, 37012, 41882, 42484, 83764, 120289, 240578, 272233, 397879, 481156, 544466, 795758, 1088932, 1591516, 5172427, 10344854, 20689708]

約数ペア:

[(1, 20689708), (2, 10344854), (4, 5172427), (13, 1591516), (19, 1088932), (26, 795758), (38, 544466), (43, 481156), (52, 397879), (76, 272233), (86, 240578), (172, 120289), (247, 83764), (487, 42484), (494, 41882), (559, 37012), (817, 25324), (974, 21242), (988, 20941), (1118, 18506), (1634, 12662), (1948, 10621), (2236, 9253), (3268, 6331)]