21907557

素因数分解:

$3^3\times 7^2\times {\mathrm{29}}^1\times {\mathrm{571}}^1$

素因数の和:623

約数の個数: 48

約数和(自身を含む): 39124800

約数和(自身を除く): 17217243

約数列:

[1, 3, 7, 9, 21, 27, 29, 49, 63, 87, 147, 189, 203, 261, 441, 571, 609, 783, 1323, 1421, 1713, 1827, 3997, 4263, 5139, 5481, 11991, 12789, 15417, 16559, 27979, 35973, 38367, 49677, 83937, 107919, 115913, 149031, 251811, 347739, 447093, 755433, 811391, 1043217, 2434173, 3129651, 7302519, 21907557]

約数ペア:

[(1, 21907557), (3, 7302519), (7, 3129651), (9, 2434173), (21, 1043217), (27, 811391), (29, 755433), (49, 447093), (63, 347739), (87, 251811), (147, 149031), (189, 115913), (203, 107919), (261, 83937), (441, 49677), (571, 38367), (609, 35973), (783, 27979), (1323, 16559), (1421, 15417), (1713, 12789), (1827, 11991), (3997, 5481), (4263, 5139)]