21002409

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{8941}}^1$

素因数の和:8982

約数の個数: 20

約数和(自身を含む): 32459460

約数和(自身を除く): 11457051

約数列:

[1, 3, 9, 27, 29, 81, 87, 261, 783, 2349, 8941, 26823, 80469, 241407, 259289, 724221, 777867, 2333601, 7000803, 21002409]

約数ペア:

[(1, 21002409), (3, 7000803), (9, 2333601), (27, 777867), (29, 724221), (81, 259289), (87, 241407), (261, 80469), (783, 26823), (2349, 8941)]