19887455

素因数分解:

$5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1$

素因数の和:287

約数の個数: 32

約数和(自身を含む): 28366848

約数和(自身を除く): 8479393

約数列:

[1, 5, 7, 35, 53, 71, 151, 265, 355, 371, 497, 755, 1057, 1855, 2485, 3763, 5285, 8003, 10721, 18815, 26341, 40015, 53605, 56021, 75047, 131705, 280105, 375235, 568213, 2841065, 3977491, 19887455]

約数ペア:

[(1, 19887455), (5, 3977491), (7, 2841065), (35, 568213), (53, 375235), (71, 280105), (151, 131705), (265, 75047), (355, 56021), (371, 53605), (497, 40015), (755, 26341), (1057, 18815), (1855, 10721), (2485, 8003), (3763, 5285)]