20913813

素因数分解:

$3^2\times {\mathrm{19}}^2\times {\mathrm{41}}^1\times {\mathrm{157}}^1$

素因数の和:242

約数の個数: 36

約数和(自身を含む): 32868108

約数和(自身を除く): 11954295

約数列:

[1, 3, 9, 19, 41, 57, 123, 157, 171, 361, 369, 471, 779, 1083, 1413, 2337, 2983, 3249, 6437, 7011, 8949, 14801, 19311, 26847, 44403, 56677, 57933, 122303, 133209, 170031, 366909, 510093, 1100727, 2323757, 6971271, 20913813]

約数ペア:

[(1, 20913813), (3, 6971271), (9, 2323757), (19, 1100727), (41, 510093), (57, 366909), (123, 170031), (157, 133209), (171, 122303), (361, 57933), (369, 56677), (471, 44403), (779, 26847), (1083, 19311), (1413, 14801), (2337, 8949), (2983, 7011), (3249, 6437)]