20421775

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{43}}^1\times {\mathrm{157}}^1$

素因数の和:232

約数の個数: 36

約数和(自身を含む): 28663096

約数和(自身を除く): 8241321

約数列:

[1, 5, 11, 25, 43, 55, 121, 157, 215, 275, 473, 605, 785, 1075, 1727, 2365, 3025, 3925, 5203, 6751, 8635, 11825, 18997, 26015, 33755, 43175, 74261, 94985, 130075, 168775, 371305, 474925, 816871, 1856525, 4084355, 20421775]

約数ペア:

[(1, 20421775), (5, 4084355), (11, 1856525), (25, 816871), (43, 474925), (55, 371305), (121, 168775), (157, 130075), (215, 94985), (275, 74261), (473, 43175), (605, 33755), (785, 26015), (1075, 18997), (1727, 11825), (2365, 8635), (3025, 6751), (3925, 5203)]