209920840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^2\times {\mathrm{43}}^1\times {\mathrm{127}}^1$

素因数の和:243

約数の個数: 96

約数和(自身を含む): 503331840

約数和(自身を除く): 293411000

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 127, 155, 172, 215, 248, 254, 310, 344, 430, 508, 620, 635, 860, 961, 1016, 1240, 1270, 1333, 1720, 1922, 2540, 2666, 3844, 3937, 4805, 5080, 5332, 5461, 6665, 7688, 7874, 9610, 10664, 10922, 13330, 15748, 19220, 19685, 21844, 26660, 27305, 31496, 38440, 39370, 41323, 43688, 53320, 54610, 78740, 82646, 109220, 122047, 157480, 165292, 169291, 206615, 218440, 244094, 330584, 338582, 413230, 488188, 610235, 677164, 826460, 846455, 976376, 1220470, 1354328, 1652920, 1692910, 2440940, 3385820, 4881880, 5248021, 6771640, 10496042, 20992084, 26240105, 41984168, 52480210, 104960420, 209920840]

約数ペア:

[(1, 209920840), (2, 104960420), (4, 52480210), (5, 41984168), (8, 26240105), (10, 20992084), (20, 10496042), (31, 6771640), (40, 5248021), (43, 4881880), (62, 3385820), (86, 2440940), (124, 1692910), (127, 1652920), (155, 1354328), (172, 1220470), (215, 976376), (248, 846455), (254, 826460), (310, 677164), (344, 610235), (430, 488188), (508, 413230), (620, 338582), (635, 330584), (860, 244094), (961, 218440), (1016, 206615), (1240, 169291), (1270, 165292), (1333, 157480), (1720, 122047), (1922, 109220), (2540, 82646), (2666, 78740), (3844, 54610), (3937, 53320), (4805, 43688), (5080, 41323), (5332, 39370), (5461, 38440), (6665, 31496), (7688, 27305), (7874, 26660), (9610, 21844), (10664, 19685), (10922, 19220), (13330, 15748)]