20997680

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{107}}^1\times {\mathrm{223}}^1$

素因数の和:354

約数の個数: 80

約数和(自身を含む): 53996544

約数和(自身を除く): 32998864

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 107, 110, 176, 214, 220, 223, 428, 440, 446, 535, 856, 880, 892, 1070, 1115, 1177, 1712, 1784, 2140, 2230, 2354, 2453, 3568, 4280, 4460, 4708, 4906, 5885, 8560, 8920, 9416, 9812, 11770, 12265, 17840, 18832, 19624, 23540, 23861, 24530, 39248, 47080, 47722, 49060, 94160, 95444, 98120, 119305, 190888, 196240, 238610, 262471, 381776, 477220, 524942, 954440, 1049884, 1312355, 1908880, 2099768, 2624710, 4199536, 5249420, 10498840, 20997680]

約数ペア:

[(1, 20997680), (2, 10498840), (4, 5249420), (5, 4199536), (8, 2624710), (10, 2099768), (11, 1908880), (16, 1312355), (20, 1049884), (22, 954440), (40, 524942), (44, 477220), (55, 381776), (80, 262471), (88, 238610), (107, 196240), (110, 190888), (176, 119305), (214, 98120), (220, 95444), (223, 94160), (428, 49060), (440, 47722), (446, 47080), (535, 39248), (856, 24530), (880, 23861), (892, 23540), (1070, 19624), (1115, 18832), (1177, 17840), (1712, 12265), (1784, 11770), (2140, 9812), (2230, 9416), (2354, 8920), (2453, 8560), (3568, 5885), (4280, 4906), (4460, 4708)]