21139980281

素因数分解:

$7^2\times {\mathrm{103}}^1\times {\mathrm{1193}}^1\times {\mathrm{3511}}^1$

素因数の和:4821

約数の個数: 24

約数和(自身を含む): 24858048384

約数和(自身を除く): 3718068103

約数列:

[1, 7, 49, 103, 721, 1193, 3511, 5047, 8351, 24577, 58457, 122879, 172039, 361633, 860153, 2531431, 4188623, 6021071, 17720017, 29320361, 205242527, 431428169, 3019997183, 21139980281]

約数ペア:

[(1, 21139980281), (7, 3019997183), (49, 431428169), (103, 205242527), (721, 29320361), (1193, 17720017), (3511, 6021071), (5047, 4188623), (8351, 2531431), (24577, 860153), (58457, 361633), (122879, 172039)]