21289960

素因数分解:

$2^3\times 5^1\times {\mathrm{532249}}^1$

素因数の和:532260

約数の個数: 16

約数和(自身を含む): 47902500

約数和(自身を除く): 26612540

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 532249, 1064498, 2128996, 2661245, 4257992, 5322490, 10644980, 21289960]

約数ペア:

[(1, 21289960), (2, 10644980), (4, 5322490), (5, 4257992), (8, 2661245), (10, 2128996), (20, 1064498), (40, 532249)]