21505160

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12503}}^1$

素因数の和:12557

約数の個数: 32

約数和(自身を含む): 49515840

約数和(自身を除く): 28010680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12503, 25006, 50012, 62515, 100024, 125030, 250060, 500120, 537629, 1075258, 2150516, 2688145, 4301032, 5376290, 10752580, 21505160]

約数ペア:

[(1, 21505160), (2, 10752580), (4, 5376290), (5, 4301032), (8, 2688145), (10, 2150516), (20, 1075258), (40, 537629), (43, 500120), (86, 250060), (172, 125030), (215, 100024), (344, 62515), (430, 50012), (860, 25006), (1720, 12503)]