19720001

素因数分解:

$7^2\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{149}}^1$

素因数の和:273

約数の個数: 24

約数和(自身を含む): 24042600

約数和(自身を除く): 4322599

約数列:

[1, 7, 37, 49, 73, 149, 259, 511, 1043, 1813, 2701, 3577, 5513, 7301, 10877, 18907, 38591, 76139, 132349, 270137, 402449, 532973, 2817143, 19720001]

約数ペア:

[(1, 19720001), (7, 2817143), (37, 532973), (49, 402449), (73, 270137), (149, 132349), (259, 76139), (511, 38591), (1043, 18907), (1813, 10877), (2701, 7301), (3577, 5513)]