21334820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2647}}^1$

素因数の和:2700

約数の個数: 48

約数和(自身を含む): 49824768

約数和(自身を除く): 28489948

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2647, 4030, 5294, 8060, 10588, 13235, 26470, 34411, 52940, 68822, 82057, 137644, 164114, 172055, 328228, 344110, 410285, 688220, 820570, 1066741, 1641140, 2133482, 4266964, 5333705, 10667410, 21334820]

約数ペア:

[(1, 21334820), (2, 10667410), (4, 5333705), (5, 4266964), (10, 2133482), (13, 1641140), (20, 1066741), (26, 820570), (31, 688220), (52, 410285), (62, 344110), (65, 328228), (124, 172055), (130, 164114), (155, 137644), (260, 82057), (310, 68822), (403, 52940), (620, 34411), (806, 26470), (1612, 13235), (2015, 10588), (2647, 8060), (4030, 5294)]