21242979

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{15427}}^1$

素因数の和:15456

約数の個数: 20

約数和(自身を含む): 33602184

約数和(自身を除く): 12359205

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 459, 1377, 15427, 46281, 138843, 262259, 416529, 786777, 1249587, 2360331, 7080993, 21242979]

約数ペア:

[(1, 21242979), (3, 7080993), (9, 2360331), (17, 1249587), (27, 786777), (51, 416529), (81, 262259), (153, 138843), (459, 46281), (1377, 15427)]