20217561

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{719}}^1$

素因数の和:845

約数の個数: 32

約数和(自身を含む): 33546240

約数和(自身を除く): 13328679

約数列:

[1, 3, 7, 13, 21, 39, 91, 103, 273, 309, 719, 721, 1339, 2157, 2163, 4017, 5033, 9347, 9373, 15099, 28041, 28119, 65429, 74057, 196287, 222171, 518399, 962741, 1555197, 2888223, 6739187, 20217561]

約数ペア:

[(1, 20217561), (3, 6739187), (7, 2888223), (13, 1555197), (21, 962741), (39, 518399), (91, 222171), (103, 196287), (273, 74057), (309, 65429), (719, 28119), (721, 28041), (1339, 15099), (2157, 9373), (2163, 9347), (4017, 5033)]