9780920

素因数分解:

$2^3\times 5^1\times {\mathrm{439}}^1\times {\mathrm{557}}^1$

素因数の和:1007

約数の個数: 32

約数和(自身を含む): 22096800

約数和(自身を除く): 12315880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 439, 557, 878, 1114, 1756, 2195, 2228, 2785, 3512, 4390, 4456, 5570, 8780, 11140, 17560, 22280, 244523, 489046, 978092, 1222615, 1956184, 2445230, 4890460, 9780920]

約数ペア:

[(1, 9780920), (2, 4890460), (4, 2445230), (5, 1956184), (8, 1222615), (10, 978092), (20, 489046), (40, 244523), (439, 22280), (557, 17560), (878, 11140), (1114, 8780), (1756, 5570), (2195, 4456), (2228, 4390), (2785, 3512)]