20947941

素因数分解:

$3^2\times 7^2\times {\mathrm{47501}}^1$

素因数の和:47521

約数の個数: 18

約数和(自身を含む): 35198982

約数和(自身を除く): 14251041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 47501, 142503, 332507, 427509, 997521, 2327549, 2992563, 6982647, 20947941]

約数ペア:

[(1, 20947941), (3, 6982647), (7, 2992563), (9, 2327549), (21, 997521), (49, 427509), (63, 332507), (147, 142503), (441, 47501)]