21421989

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{331}}^1$

素因数の和:407

約数の個数: 40

約数和(自身を含む): 34708608

約数和(自身を除く): 13286619

約数列:

[1, 3, 9, 17, 27, 47, 51, 81, 141, 153, 331, 423, 459, 799, 993, 1269, 1377, 2397, 2979, 3807, 5627, 7191, 8937, 15557, 16881, 21573, 26811, 46671, 50643, 64719, 140013, 151929, 264469, 420039, 455787, 793407, 1260117, 2380221, 7140663, 21421989]

約数ペア:

[(1, 21421989), (3, 7140663), (9, 2380221), (17, 1260117), (27, 793407), (47, 455787), (51, 420039), (81, 264469), (141, 151929), (153, 140013), (331, 64719), (423, 50643), (459, 46671), (799, 26811), (993, 21573), (1269, 16881), (1377, 15557), (2397, 8937), (2979, 7191), (3807, 5627)]