20649640

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{661}}^1$

素因数の和:754

約数の個数: 64

約数和(自身を含む): 51477120

約数和(自身を除く): 30827480

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 110, 142, 220, 284, 355, 440, 568, 661, 710, 781, 1322, 1420, 1562, 2644, 2840, 3124, 3305, 3905, 5288, 6248, 6610, 7271, 7810, 13220, 14542, 15620, 26440, 29084, 31240, 36355, 46931, 58168, 72710, 93862, 145420, 187724, 234655, 290840, 375448, 469310, 516241, 938620, 1032482, 1877240, 2064964, 2581205, 4129928, 5162410, 10324820, 20649640]

約数ペア:

[(1, 20649640), (2, 10324820), (4, 5162410), (5, 4129928), (8, 2581205), (10, 2064964), (11, 1877240), (20, 1032482), (22, 938620), (40, 516241), (44, 469310), (55, 375448), (71, 290840), (88, 234655), (110, 187724), (142, 145420), (220, 93862), (284, 72710), (355, 58168), (440, 46931), (568, 36355), (661, 31240), (710, 29084), (781, 26440), (1322, 15620), (1420, 14542), (1562, 13220), (2644, 7810), (2840, 7271), (3124, 6610), (3305, 6248), (3905, 5288)]