21136880

素因数分解:

$2^4\times 5^1\times {\mathrm{264211}}^1$

素因数の和:264224

約数の個数: 20

約数和(自身を含む): 49143432

約数和(自身を除く): 28006552

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264211, 528422, 1056844, 1321055, 2113688, 2642110, 4227376, 5284220, 10568440, 21136880]

約数ペア:

[(1, 21136880), (2, 10568440), (4, 5284220), (5, 4227376), (8, 2642110), (10, 2113688), (16, 1321055), (20, 1056844), (40, 528422), (80, 264211)]