28161980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{18287}}^1$

素因数の和:18314

約数の個数: 48

約数和(自身を含む): 73737216

約数和(自身を除く): 45575236

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 18287, 36574, 73148, 91435, 128009, 182870, 201157, 256018, 365740, 402314, 512036, 640045, 804628, 1005785, 1280090, 1408099, 2011570, 2560180, 2816198, 4023140, 5632396, 7040495, 14080990, 28161980]

約数ペア:

[(1, 28161980), (2, 14080990), (4, 7040495), (5, 5632396), (7, 4023140), (10, 2816198), (11, 2560180), (14, 2011570), (20, 1408099), (22, 1280090), (28, 1005785), (35, 804628), (44, 640045), (55, 512036), (70, 402314), (77, 365740), (110, 256018), (140, 201157), (154, 182870), (220, 128009), (308, 91435), (385, 73148), (770, 36574), (1540, 18287)]