21081520

素因数分解:

$2^4\times 5^1\times {\mathrm{263519}}^1$

素因数の和:263532

約数の個数: 20

約数和(自身を含む): 49014720

約数和(自身を除く): 27933200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263519, 527038, 1054076, 1317595, 2108152, 2635190, 4216304, 5270380, 10540760, 21081520]

約数ペア:

[(1, 21081520), (2, 10540760), (4, 5270380), (5, 4216304), (8, 2635190), (10, 2108152), (16, 1317595), (20, 1054076), (40, 527038), (80, 263519)]