21978140

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1\times {\mathrm{227}}^1$

素因数の和:386

約数の個数: 48

約数和(自身を含む): 47803392

約数和(自身を除く): 25825252

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 103, 188, 206, 227, 235, 412, 454, 470, 515, 908, 940, 1030, 1135, 2060, 2270, 4540, 4841, 9682, 10669, 19364, 21338, 23381, 24205, 42676, 46762, 48410, 53345, 93524, 96820, 106690, 116905, 213380, 233810, 467620, 1098907, 2197814, 4395628, 5494535, 10989070, 21978140]

約数ペア:

[(1, 21978140), (2, 10989070), (4, 5494535), (5, 4395628), (10, 2197814), (20, 1098907), (47, 467620), (94, 233810), (103, 213380), (188, 116905), (206, 106690), (227, 96820), (235, 93524), (412, 53345), (454, 48410), (470, 46762), (515, 42676), (908, 24205), (940, 23381), (1030, 21338), (1135, 19364), (2060, 10669), (2270, 9682), (4540, 4841)]