21440391

素因数分解:

$3^1\times 7^2\times {\mathrm{157}}^1\times {\mathrm{929}}^1$

素因数の和:1103

約数の個数: 24

約数和(自身を含む): 33502320

約数和(自身を除く): 12061929

約数列:

[1, 3, 7, 21, 49, 147, 157, 471, 929, 1099, 2787, 3297, 6503, 7693, 19509, 23079, 45521, 136563, 145853, 437559, 1020971, 3062913, 7146797, 21440391]

約数ペア:

[(1, 21440391), (3, 7146797), (7, 3062913), (21, 1020971), (49, 437559), (147, 145853), (157, 136563), (471, 45521), (929, 23079), (1099, 19509), (2787, 7693), (3297, 6503)]