21005715

素因数分解:

$3^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{1123}}^1$

素因数の和:1203

約数の個数: 32

約数和(自身を含む): 35608320

約数和(自身を除く): 14602605

約数列:

[1, 3, 5, 15, 29, 43, 87, 129, 145, 215, 435, 645, 1123, 1247, 3369, 3741, 5615, 6235, 16845, 18705, 32567, 48289, 97701, 144867, 162835, 241445, 488505, 724335, 1400381, 4201143, 7001905, 21005715]

約数ペア:

[(1, 21005715), (3, 7001905), (5, 4201143), (15, 1400381), (29, 724335), (43, 488505), (87, 241445), (129, 162835), (145, 144867), (215, 97701), (435, 48289), (645, 32567), (1123, 18705), (1247, 16845), (3369, 6235), (3741, 5615)]