20915680

素因数分解:

$2^5\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2143}}^1$

素因数の和:2219

約数の個数: 48

約数和(自身を含む): 50246784

約数和(自身を除く): 29331104

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 80, 122, 160, 244, 305, 488, 610, 976, 1220, 1952, 2143, 2440, 4286, 4880, 8572, 9760, 10715, 17144, 21430, 34288, 42860, 68576, 85720, 130723, 171440, 261446, 342880, 522892, 653615, 1045784, 1307230, 2091568, 2614460, 4183136, 5228920, 10457840, 20915680]

約数ペア:

[(1, 20915680), (2, 10457840), (4, 5228920), (5, 4183136), (8, 2614460), (10, 2091568), (16, 1307230), (20, 1045784), (32, 653615), (40, 522892), (61, 342880), (80, 261446), (122, 171440), (160, 130723), (244, 85720), (305, 68576), (488, 42860), (610, 34288), (976, 21430), (1220, 17144), (1952, 10715), (2143, 9760), (2440, 8572), (4286, 4880)]