21129560

素因数分解:

$2^3\times 5^1\times {\mathrm{277}}^1\times {\mathrm{1907}}^1$

素因数の和:2195

約数の個数: 32

約数和(自身を含む): 47738160

約数和(自身を除く): 26608600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 277, 554, 1108, 1385, 1907, 2216, 2770, 3814, 5540, 7628, 9535, 11080, 15256, 19070, 38140, 76280, 528239, 1056478, 2112956, 2641195, 4225912, 5282390, 10564780, 21129560]

約数ペア:

[(1, 21129560), (2, 10564780), (4, 5282390), (5, 4225912), (8, 2641195), (10, 2112956), (20, 1056478), (40, 528239), (277, 76280), (554, 38140), (1108, 19070), (1385, 15256), (1907, 11080), (2216, 9535), (2770, 7628), (3814, 5540)]