21491757

素因数分解:

$3^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{6689}}^1$

素因数の和:6722

約数の個数: 32

約数和(自身を含む): 38534400

約数和(自身を除く): 17042643

約数列:

[1, 3, 7, 9, 17, 21, 27, 51, 63, 119, 153, 189, 357, 459, 1071, 3213, 6689, 20067, 46823, 60201, 113713, 140469, 180603, 341139, 421407, 795991, 1023417, 1264221, 2387973, 3070251, 7163919, 21491757]

約数ペア:

[(1, 21491757), (3, 7163919), (7, 3070251), (9, 2387973), (17, 1264221), (21, 1023417), (27, 795991), (51, 421407), (63, 341139), (119, 180603), (153, 140469), (189, 113713), (357, 60201), (459, 46823), (1071, 20067), (3213, 6689)]