21721720

素因数分解:

$2^3\times 5^1\times {\mathrm{439}}^1\times {\mathrm{1237}}^1$

素因数の和:1687

約数の個数: 32

約数和(自身を含む): 49024800

約数和(自身を除く): 27303080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 439, 878, 1237, 1756, 2195, 2474, 3512, 4390, 4948, 6185, 8780, 9896, 12370, 17560, 24740, 49480, 543043, 1086086, 2172172, 2715215, 4344344, 5430430, 10860860, 21721720]

約数ペア:

[(1, 21721720), (2, 10860860), (4, 5430430), (5, 4344344), (8, 2715215), (10, 2172172), (20, 1086086), (40, 543043), (439, 49480), (878, 24740), (1237, 17560), (1756, 12370), (2195, 9896), (2474, 8780), (3512, 6185), (4390, 4948)]