20665155

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 40550400

約数和(自身を除く): 19885245

約数列:

[1, 3, 5, 7, 15, 21, 23, 35, 43, 69, 105, 115, 129, 161, 199, 215, 301, 345, 483, 597, 645, 805, 903, 989, 995, 1393, 1505, 2415, 2967, 2985, 4179, 4515, 4577, 4945, 6923, 6965, 8557, 13731, 14835, 20769, 20895, 22885, 25671, 32039, 34615, 42785, 59899, 68655, 96117, 103845, 128355, 160195, 179697, 196811, 299495, 480585, 590433, 898485, 984055, 1377677, 2952165, 4133031, 6888385, 20665155]

約数ペア:

[(1, 20665155), (3, 6888385), (5, 4133031), (7, 2952165), (15, 1377677), (21, 984055), (23, 898485), (35, 590433), (43, 480585), (69, 299495), (105, 196811), (115, 179697), (129, 160195), (161, 128355), (199, 103845), (215, 96117), (301, 68655), (345, 59899), (483, 42785), (597, 34615), (645, 32039), (805, 25671), (903, 22885), (989, 20895), (995, 20769), (1393, 14835), (1505, 13731), (2415, 8557), (2967, 6965), (2985, 6923), (4179, 4945), (4515, 4577)]