20981012

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{757}}^1$

素因数の和:828

約数の個数: 36

約数和(自身を含む): 40781916

約数和(自身を除く): 19800904

約数列:

[1, 2, 4, 13, 26, 41, 52, 82, 164, 169, 338, 533, 676, 757, 1066, 1514, 2132, 3028, 6929, 9841, 13858, 19682, 27716, 31037, 39364, 62074, 124148, 127933, 255866, 403481, 511732, 806962, 1613924, 5245253, 10490506, 20981012]

約数ペア:

[(1, 20981012), (2, 10490506), (4, 5245253), (13, 1613924), (26, 806962), (41, 511732), (52, 403481), (82, 255866), (164, 127933), (169, 124148), (338, 62074), (533, 39364), (676, 31037), (757, 27716), (1066, 19682), (1514, 13858), (2132, 9841), (3028, 6929)]