21285040

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{191}}^1\times {\mathrm{199}}^1$

素因数の和:410

約数の個数: 80

約数和(自身を含む): 57139200

約数和(自身を除く): 35854160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 191, 199, 280, 382, 398, 560, 764, 796, 955, 995, 1337, 1393, 1528, 1592, 1910, 1990, 2674, 2786, 3056, 3184, 3820, 3980, 5348, 5572, 6685, 6965, 7640, 7960, 10696, 11144, 13370, 13930, 15280, 15920, 21392, 22288, 26740, 27860, 38009, 53480, 55720, 76018, 106960, 111440, 152036, 190045, 266063, 304072, 380090, 532126, 608144, 760180, 1064252, 1330315, 1520360, 2128504, 2660630, 3040720, 4257008, 5321260, 10642520, 21285040]

約数ペア:

[(1, 21285040), (2, 10642520), (4, 5321260), (5, 4257008), (7, 3040720), (8, 2660630), (10, 2128504), (14, 1520360), (16, 1330315), (20, 1064252), (28, 760180), (35, 608144), (40, 532126), (56, 380090), (70, 304072), (80, 266063), (112, 190045), (140, 152036), (191, 111440), (199, 106960), (280, 76018), (382, 55720), (398, 53480), (560, 38009), (764, 27860), (796, 26740), (955, 22288), (995, 21392), (1337, 15920), (1393, 15280), (1528, 13930), (1592, 13370), (1910, 11144), (1990, 10696), (2674, 7960), (2786, 7640), (3056, 6965), (3184, 6685), (3820, 5572), (3980, 5348)]