20513619

素因数分解:

$3^2\times 7^1\times {\mathrm{359}}^1\times {\mathrm{907}}^1$

素因数の和:1279

約数の個数: 24

約数和(自身を含む): 33995520

約数和(自身を除く): 13481901

約数列:

[1, 3, 7, 9, 21, 63, 359, 907, 1077, 2513, 2721, 3231, 6349, 7539, 8163, 19047, 22617, 57141, 325613, 976839, 2279291, 2930517, 6837873, 20513619]

約数ペア:

[(1, 20513619), (3, 6837873), (7, 2930517), (9, 2279291), (21, 976839), (63, 325613), (359, 57141), (907, 22617), (1077, 19047), (2513, 8163), (2721, 7539), (3231, 6349)]