19854440

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6991}}^1$

素因数の和:7073

約数の個数: 32

約数和(自身を含む): 45308160

約数和(自身を除く): 25453720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 6991, 13982, 27964, 34955, 55928, 69910, 139820, 279640, 496361, 992722, 1985444, 2481805, 3970888, 4963610, 9927220, 19854440]

約数ペア:

[(1, 19854440), (2, 9927220), (4, 4963610), (5, 3970888), (8, 2481805), (10, 1985444), (20, 992722), (40, 496361), (71, 279640), (142, 139820), (284, 69910), (355, 55928), (568, 34955), (710, 27964), (1420, 13982), (2840, 6991)]