21007431

素因数分解:

$3^4\times {\mathrm{167}}^1\times {\mathrm{1553}}^1$

素因数の和:1732

約数の個数: 20

約数和(自身を含む): 31589712

約数和(自身を除く): 10582281

約数列:

[1, 3, 9, 27, 81, 167, 501, 1503, 1553, 4509, 4659, 13527, 13977, 41931, 125793, 259351, 778053, 2334159, 7002477, 21007431]

約数ペア:

[(1, 21007431), (3, 7002477), (9, 2334159), (27, 778053), (81, 259351), (167, 125793), (501, 41931), (1503, 13977), (1553, 13527), (4509, 4659)]