21081680

素因数分解:

$2^4\times 5^1\times {\mathrm{263521}}^1$

素因数の和:263534

約数の個数: 20

約数和(自身を含む): 49015092

約数和(自身を除く): 27933412

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263521, 527042, 1054084, 1317605, 2108168, 2635210, 4216336, 5270420, 10540840, 21081680]

約数ペア:

[(1, 21081680), (2, 10540840), (4, 5270420), (5, 4216336), (8, 2635210), (10, 2108168), (16, 1317605), (20, 1054084), (40, 527042), (80, 263521)]