20421220

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{137}}^1\times {\mathrm{257}}^1$

素因数の和:432

約数の個数: 48

約数和(自身を含む): 44861040

約数和(自身を除く): 24439820

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 137, 145, 257, 274, 290, 514, 548, 580, 685, 1028, 1285, 1370, 2570, 2740, 3973, 5140, 7453, 7946, 14906, 15892, 19865, 29812, 35209, 37265, 39730, 70418, 74530, 79460, 140836, 149060, 176045, 352090, 704180, 1021061, 2042122, 4084244, 5105305, 10210610, 20421220]

約数ペア:

[(1, 20421220), (2, 10210610), (4, 5105305), (5, 4084244), (10, 2042122), (20, 1021061), (29, 704180), (58, 352090), (116, 176045), (137, 149060), (145, 140836), (257, 79460), (274, 74530), (290, 70418), (514, 39730), (548, 37265), (580, 35209), (685, 29812), (1028, 19865), (1285, 15892), (1370, 14906), (2570, 7946), (2740, 7453), (3973, 5140)]