21397825

素因数分解:

$5^2\times {\mathrm{59}}^1\times {\mathrm{89}}^1\times {\mathrm{163}}^1$

素因数の和:321

約数の個数: 24

約数和(自身を含む): 27453600

約数和(自身を除く): 6055775

約数列:

[1, 5, 25, 59, 89, 163, 295, 445, 815, 1475, 2225, 4075, 5251, 9617, 14507, 26255, 48085, 72535, 131275, 240425, 362675, 855913, 4279565, 21397825]

約数ペア:

[(1, 21397825), (5, 4279565), (25, 855913), (59, 362675), (89, 240425), (163, 131275), (295, 72535), (445, 48085), (815, 26255), (1475, 14507), (2225, 9617), (4075, 5251)]