21291921

素因数分解:

$3^2\times 7^2\times {\mathrm{48281}}^1$

素因数の和:48301

約数の個数: 18

約数和(自身を含む): 35776962

約数和(自身を除く): 14485041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 48281, 144843, 337967, 434529, 1013901, 2365769, 3041703, 7097307, 21291921]

約数ペア:

[(1, 21291921), (3, 7097307), (7, 3041703), (9, 2365769), (21, 1013901), (49, 434529), (63, 337967), (147, 144843), (441, 48281)]