19989340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2011}}^1$

素因数の和:2098

約数の個数: 48

約数和(自身を含む): 48674304

約数和(自身を除く): 28684964

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2011, 2485, 4022, 4970, 8044, 9940, 10055, 14077, 20110, 28154, 40220, 56308, 70385, 140770, 142781, 281540, 285562, 571124, 713905, 999467, 1427810, 1998934, 2855620, 3997868, 4997335, 9994670, 19989340]

約数ペア:

[(1, 19989340), (2, 9994670), (4, 4997335), (5, 3997868), (7, 2855620), (10, 1998934), (14, 1427810), (20, 999467), (28, 713905), (35, 571124), (70, 285562), (71, 281540), (140, 142781), (142, 140770), (284, 70385), (355, 56308), (497, 40220), (710, 28154), (994, 20110), (1420, 14077), (1988, 10055), (2011, 9940), (2485, 8044), (4022, 4970)]