21307779

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{193}}^1$

素因数の和:281

約数の個数: 40

約数和(自身を含む): 33802560

約数和(自身を除く): 12494781

約数列:

[1, 3, 9, 27, 29, 47, 81, 87, 141, 193, 261, 423, 579, 783, 1269, 1363, 1737, 2349, 3807, 4089, 5211, 5597, 9071, 12267, 15633, 16791, 27213, 36801, 50373, 81639, 110403, 151119, 244917, 263059, 453357, 734751, 789177, 2367531, 7102593, 21307779]

約数ペア:

[(1, 21307779), (3, 7102593), (9, 2367531), (27, 789177), (29, 734751), (47, 453357), (81, 263059), (87, 244917), (141, 151119), (193, 110403), (261, 81639), (423, 50373), (579, 36801), (783, 27213), (1269, 16791), (1363, 15633), (1737, 12267), (2349, 9071), (3807, 5597), (4089, 5211)]