71120021

素因数分解:

$7^4\times {\mathrm{19}}^1\times {\mathrm{1559}}^1$

素因数の和:1606

約数の個数: 20

約数和(自身を含む): 87391200

約数和(自身を除く): 16271179

約数列:

[1, 7, 19, 49, 133, 343, 931, 1559, 2401, 6517, 10913, 29621, 45619, 76391, 207347, 534737, 1451429, 3743159, 10160003, 71120021]

約数ペア:

[(1, 71120021), (7, 10160003), (19, 3743159), (49, 1451429), (133, 534737), (343, 207347), (931, 76391), (1559, 45619), (2401, 29621), (6517, 10913)]