21876820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{307}}^1\times {\mathrm{509}}^1$

素因数の和:832

約数の個数: 48

約数和(自身を含む): 52778880

約数和(自身を除く): 30902060

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 307, 509, 614, 1018, 1228, 1535, 2036, 2149, 2545, 3070, 3563, 4298, 5090, 6140, 7126, 8596, 10180, 10745, 14252, 17815, 21490, 35630, 42980, 71260, 156263, 312526, 625052, 781315, 1093841, 1562630, 2187682, 3125260, 4375364, 5469205, 10938410, 21876820]

約数ペア:

[(1, 21876820), (2, 10938410), (4, 5469205), (5, 4375364), (7, 3125260), (10, 2187682), (14, 1562630), (20, 1093841), (28, 781315), (35, 625052), (70, 312526), (140, 156263), (307, 71260), (509, 42980), (614, 35630), (1018, 21490), (1228, 17815), (1535, 14252), (2036, 10745), (2149, 10180), (2545, 8596), (3070, 7126), (3563, 6140), (4298, 5090)]