21997780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157127}}^1$

素因数の和:157143

約数の個数: 24

約数和(自身を含む): 52795008

約数和(自身を除く): 30797228

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157127, 314254, 628508, 785635, 1099889, 1571270, 2199778, 3142540, 4399556, 5499445, 10998890, 21997780]

約数ペア:

[(1, 21997780), (2, 10998890), (4, 5499445), (5, 4399556), (7, 3142540), (10, 2199778), (14, 1571270), (20, 1099889), (28, 785635), (35, 628508), (70, 314254), (140, 157127)]