19991641820

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{343381}}^1$

素因数の和:343502

約数の個数: 48

約数和(自身を含む): 43612261056

約数和(自身を除く): 23620619236

約数列:

[1, 2, 4, 5, 10, 20, 41, 71, 82, 142, 164, 205, 284, 355, 410, 710, 820, 1420, 2911, 5822, 11644, 14555, 29110, 58220, 343381, 686762, 1373524, 1716905, 3433810, 6867620, 14078621, 24380051, 28157242, 48760102, 56314484, 70393105, 97520204, 121900255, 140786210, 243800510, 281572420, 487601020, 999582091, 1999164182, 3998328364, 4997910455, 9995820910, 19991641820]

約数ペア:

[(1, 19991641820), (2, 9995820910), (4, 4997910455), (5, 3998328364), (10, 1999164182), (20, 999582091), (41, 487601020), (71, 281572420), (82, 243800510), (142, 140786210), (164, 121900255), (205, 97520204), (284, 70393105), (355, 56314484), (410, 48760102), (710, 28157242), (820, 24380051), (1420, 14078621), (2911, 6867620), (5822, 3433810), (11644, 1716905), (14555, 1373524), (29110, 686762), (58220, 343381)]