81020920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{127}}^1\times {\mathrm{389}}^1$

素因数の和:568

約数の個数: 64

約数和(自身を含む): 188697600

約数和(自身を除く): 107676680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 127, 164, 205, 254, 328, 389, 410, 508, 635, 778, 820, 1016, 1270, 1556, 1640, 1945, 2540, 3112, 3890, 5080, 5207, 7780, 10414, 15560, 15949, 20828, 26035, 31898, 41656, 49403, 52070, 63796, 79745, 98806, 104140, 127592, 159490, 197612, 208280, 247015, 318980, 395224, 494030, 637960, 988060, 1976120, 2025523, 4051046, 8102092, 10127615, 16204184, 20255230, 40510460, 81020920]

約数ペア:

[(1, 81020920), (2, 40510460), (4, 20255230), (5, 16204184), (8, 10127615), (10, 8102092), (20, 4051046), (40, 2025523), (41, 1976120), (82, 988060), (127, 637960), (164, 494030), (205, 395224), (254, 318980), (328, 247015), (389, 208280), (410, 197612), (508, 159490), (635, 127592), (778, 104140), (820, 98806), (1016, 79745), (1270, 63796), (1556, 52070), (1640, 49403), (1945, 41656), (2540, 31898), (3112, 26035), (3890, 20828), (5080, 15949), (5207, 15560), (7780, 10414)]