21046240

素因数分解:

$2^5\times 5^1\times {\mathrm{199}}^1\times {\mathrm{661}}^1$

素因数の和:875

約数の個数: 48

約数和(自身を含む): 50047200

約数和(自身を除く): 29000960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 199, 398, 661, 796, 995, 1322, 1592, 1990, 2644, 3184, 3305, 3980, 5288, 6368, 6610, 7960, 10576, 13220, 15920, 21152, 26440, 31840, 52880, 105760, 131539, 263078, 526156, 657695, 1052312, 1315390, 2104624, 2630780, 4209248, 5261560, 10523120, 21046240]

約数ペア:

[(1, 21046240), (2, 10523120), (4, 5261560), (5, 4209248), (8, 2630780), (10, 2104624), (16, 1315390), (20, 1052312), (32, 657695), (40, 526156), (80, 263078), (160, 131539), (199, 105760), (398, 52880), (661, 31840), (796, 26440), (995, 21152), (1322, 15920), (1592, 13220), (1990, 10576), (2644, 7960), (3184, 6610), (3305, 6368), (3980, 5288)]