217840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{389}}^1$

素因数の和:409

約数の個数: 40

約数和(自身を含む): 580320

約数和(自身を除く): 362480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 280, 389, 560, 778, 1556, 1945, 2723, 3112, 3890, 5446, 6224, 7780, 10892, 13615, 15560, 21784, 27230, 31120, 43568, 54460, 108920, 217840]

約数ペア:

[(1, 217840), (2, 108920), (4, 54460), (5, 43568), (7, 31120), (8, 27230), (10, 21784), (14, 15560), (16, 13615), (20, 10892), (28, 7780), (35, 6224), (40, 5446), (56, 3890), (70, 3112), (80, 2723), (112, 1945), (140, 1556), (280, 778), (389, 560)]