21081040

素因数分解:

$2^4\times 5^1\times {\mathrm{263513}}^1$

素因数の和:263526

約数の個数: 20

約数和(自身を含む): 49013604

約数和(自身を除く): 27932564

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263513, 527026, 1054052, 1317565, 2108104, 2635130, 4216208, 5270260, 10540520, 21081040]

約数ペア:

[(1, 21081040), (2, 10540520), (4, 5270260), (5, 4216208), (8, 2635130), (10, 2108104), (16, 1317565), (20, 1054052), (40, 527026), (80, 263513)]