21291363920

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{1914691}}^1$

素因数の和:1914843

約数の個数: 40

約数和(自身を含む): 49858579680

約数和(自身を除く): 28567215760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 2224, 2780, 5560, 11120, 1914691, 3829382, 7658764, 9573455, 15317528, 19146910, 30635056, 38293820, 76587640, 153175280, 266142049, 532284098, 1064568196, 1330710245, 2129136392, 2661420490, 4258272784, 5322840980, 10645681960, 21291363920]

約数ペア:

[(1, 21291363920), (2, 10645681960), (4, 5322840980), (5, 4258272784), (8, 2661420490), (10, 2129136392), (16, 1330710245), (20, 1064568196), (40, 532284098), (80, 266142049), (139, 153175280), (278, 76587640), (556, 38293820), (695, 30635056), (1112, 19146910), (1390, 15317528), (2224, 9573455), (2780, 7658764), (5560, 3829382), (11120, 1914691)]