20409440

素因数分解:

$2^5\times 5^1\times {\mathrm{199}}^1\times {\mathrm{641}}^1$

素因数の和:855

約数の個数: 48

約数和(自身を含む): 48535200

約数和(自身を除く): 28125760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 199, 398, 641, 796, 995, 1282, 1592, 1990, 2564, 3184, 3205, 3980, 5128, 6368, 6410, 7960, 10256, 12820, 15920, 20512, 25640, 31840, 51280, 102560, 127559, 255118, 510236, 637795, 1020472, 1275590, 2040944, 2551180, 4081888, 5102360, 10204720, 20409440]

約数ペア:

[(1, 20409440), (2, 10204720), (4, 5102360), (5, 4081888), (8, 2551180), (10, 2040944), (16, 1275590), (20, 1020472), (32, 637795), (40, 510236), (80, 255118), (160, 127559), (199, 102560), (398, 51280), (641, 31840), (796, 25640), (995, 20512), (1282, 15920), (1592, 12820), (1990, 10256), (2564, 7960), (3184, 6410), (3205, 6368), (3980, 5128)]