21039921

素因数分解:

$3^2\times 7^1\times {\mathrm{337}}^1\times {\mathrm{991}}^1$

素因数の和:1341

約数の個数: 24

約数和(自身を含む): 34870784

約数和(自身を除く): 13830863

約数列:

[1, 3, 7, 9, 21, 63, 337, 991, 1011, 2359, 2973, 3033, 6937, 7077, 8919, 20811, 21231, 62433, 333967, 1001901, 2337769, 3005703, 7013307, 21039921]

約数ペア:

[(1, 21039921), (3, 7013307), (7, 3005703), (9, 2337769), (21, 1001901), (63, 333967), (337, 62433), (991, 21231), (1011, 20811), (2359, 8919), (2973, 7077), (3033, 6937)]