20477639

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:136

約数の個数: 48

約数和(自身を含む): 28498176

約数和(自身を除く): 8020537

約数列:

[1, 7, 13, 17, 31, 49, 61, 91, 119, 217, 221, 403, 427, 527, 637, 793, 833, 1037, 1519, 1547, 1891, 2821, 2989, 3689, 5551, 6851, 7259, 10829, 13237, 13481, 19747, 24583, 25823, 32147, 38857, 47957, 50813, 92659, 94367, 172081, 225029, 335699, 417911, 660569, 1204567, 1575203, 2925377, 20477639]

約数ペア:

[(1, 20477639), (7, 2925377), (13, 1575203), (17, 1204567), (31, 660569), (49, 417911), (61, 335699), (91, 225029), (119, 172081), (217, 94367), (221, 92659), (403, 50813), (427, 47957), (527, 38857), (637, 32147), (793, 25823), (833, 24583), (1037, 19747), (1519, 13481), (1547, 13237), (1891, 10829), (2821, 7259), (2989, 6851), (3689, 5551)]