21456880

素因数分解:

$2^4\times 5^1\times {\mathrm{268211}}^1$

素因数の和:268224

約数の個数: 20

約数和(自身を含む): 49887432

約数和(自身を除く): 28430552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268211, 536422, 1072844, 1341055, 2145688, 2682110, 4291376, 5364220, 10728440, 21456880]

約数ペア:

[(1, 21456880), (2, 10728440), (4, 5364220), (5, 4291376), (8, 2682110), (10, 2145688), (16, 1341055), (20, 1072844), (40, 536422), (80, 268211)]