20971839

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{52561}}^1$

素因数の和:52590

約数の個数: 16

約数和(自身を含む): 33639680

約数和(自身を除く): 12667841

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 52561, 157683, 367927, 998659, 1103781, 2995977, 6990613, 20971839]

約数ペア:

[(1, 20971839), (3, 6990613), (7, 2995977), (19, 1103781), (21, 998659), (57, 367927), (133, 157683), (399, 52561)]