20904950

素因数分解:

$2^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{191}}^1\times {\mathrm{199}}^1$

素因数の和:413

約数の個数: 48

約数和(自身を含む): 42854400

約数和(自身を除く): 21949450

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 191, 199, 275, 382, 398, 550, 955, 995, 1910, 1990, 2101, 2189, 4202, 4378, 4775, 4975, 9550, 9950, 10505, 10945, 21010, 21890, 38009, 52525, 54725, 76018, 105050, 109450, 190045, 380090, 418099, 836198, 950225, 1900450, 2090495, 4180990, 10452475, 20904950]

約数ペア:

[(1, 20904950), (2, 10452475), (5, 4180990), (10, 2090495), (11, 1900450), (22, 950225), (25, 836198), (50, 418099), (55, 380090), (110, 190045), (191, 109450), (199, 105050), (275, 76018), (382, 54725), (398, 52525), (550, 38009), (955, 21890), (995, 21010), (1910, 10945), (1990, 10505), (2101, 9950), (2189, 9550), (4202, 4975), (4378, 4775)]