19561840

素因数分解:

$2^4\times 5^1\times {\mathrm{439}}^1\times {\mathrm{557}}^1$

素因数の和:1009

約数の個数: 40

約数和(自身を含む): 45666720

約数和(自身を除く): 26104880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 439, 557, 878, 1114, 1756, 2195, 2228, 2785, 3512, 4390, 4456, 5570, 7024, 8780, 8912, 11140, 17560, 22280, 35120, 44560, 244523, 489046, 978092, 1222615, 1956184, 2445230, 3912368, 4890460, 9780920, 19561840]

約数ペア:

[(1, 19561840), (2, 9780920), (4, 4890460), (5, 3912368), (8, 2445230), (10, 1956184), (16, 1222615), (20, 978092), (40, 489046), (80, 244523), (439, 44560), (557, 35120), (878, 22280), (1114, 17560), (1756, 11140), (2195, 8912), (2228, 8780), (2785, 7024), (3512, 5570), (4390, 4456)]