81269720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{290249}}^1$

素因数の和:290267

約数の個数: 32

約数和(自身を含む): 208980000

約数和(自身を除く): 127710280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 290249, 580498, 1160996, 1451245, 2031743, 2321992, 2902490, 4063486, 5804980, 8126972, 10158715, 11609960, 16253944, 20317430, 40634860, 81269720]

約数ペア:

[(1, 81269720), (2, 40634860), (4, 20317430), (5, 16253944), (7, 11609960), (8, 10158715), (10, 8126972), (14, 5804980), (20, 4063486), (28, 2902490), (35, 2321992), (40, 2031743), (56, 1451245), (70, 1160996), (140, 580498), (280, 290249)]