20987307

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{239}}^1\times {\mathrm{887}}^1$

素因数の和:1143

約数の個数: 24

約数和(自身を含む): 33246720

約数和(自身を除く): 12259413

約数列:

[1, 3, 9, 11, 33, 99, 239, 717, 887, 2151, 2629, 2661, 7887, 7983, 9757, 23661, 29271, 87813, 211993, 635979, 1907937, 2331923, 6995769, 20987307]

約数ペア:

[(1, 20987307), (3, 6995769), (9, 2331923), (11, 1907937), (33, 635979), (99, 211993), (239, 87813), (717, 29271), (887, 23661), (2151, 9757), (2629, 7983), (2661, 7887)]