20902960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{199}}^1$

素因数の和:326

約数の個数: 80

約数和(自身を含む): 53121600

約数和(自身を除く): 32218640

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 101, 104, 130, 199, 202, 208, 260, 398, 404, 505, 520, 796, 808, 995, 1010, 1040, 1313, 1592, 1616, 1990, 2020, 2587, 2626, 3184, 3980, 4040, 5174, 5252, 6565, 7960, 8080, 10348, 10504, 12935, 13130, 15920, 20099, 20696, 21008, 25870, 26260, 40198, 41392, 51740, 52520, 80396, 100495, 103480, 105040, 160792, 200990, 206960, 261287, 321584, 401980, 522574, 803960, 1045148, 1306435, 1607920, 2090296, 2612870, 4180592, 5225740, 10451480, 20902960]

約数ペア:

[(1, 20902960), (2, 10451480), (4, 5225740), (5, 4180592), (8, 2612870), (10, 2090296), (13, 1607920), (16, 1306435), (20, 1045148), (26, 803960), (40, 522574), (52, 401980), (65, 321584), (80, 261287), (101, 206960), (104, 200990), (130, 160792), (199, 105040), (202, 103480), (208, 100495), (260, 80396), (398, 52520), (404, 51740), (505, 41392), (520, 40198), (796, 26260), (808, 25870), (995, 21008), (1010, 20696), (1040, 20099), (1313, 15920), (1592, 13130), (1616, 12935), (1990, 10504), (2020, 10348), (2587, 8080), (2626, 7960), (3184, 6565), (3980, 5252), (4040, 5174)]