21481520

素因数分解:

$2^4\times 5^1\times {\mathrm{268519}}^1$

素因数の和:268532

約数の個数: 20

約数和(自身を含む): 49944720

約数和(自身を除く): 28463200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268519, 537038, 1074076, 1342595, 2148152, 2685190, 4296304, 5370380, 10740760, 21481520]

約数ペア:

[(1, 21481520), (2, 10740760), (4, 5370380), (5, 4296304), (8, 2685190), (10, 2148152), (16, 1342595), (20, 1074076), (40, 537038), (80, 268519)]