21109720

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7433}}^1$

素因数の和:7515

約数の個数: 32

約数和(自身を含む): 48172320

約数和(自身を除く): 27062600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7433, 14866, 29732, 37165, 59464, 74330, 148660, 297320, 527743, 1055486, 2110972, 2638715, 4221944, 5277430, 10554860, 21109720]

約数ペア:

[(1, 21109720), (2, 10554860), (4, 5277430), (5, 4221944), (8, 2638715), (10, 2110972), (20, 1055486), (40, 527743), (71, 297320), (142, 148660), (284, 74330), (355, 59464), (568, 37165), (710, 29732), (1420, 14866), (2840, 7433)]