20949901

素因数分解:

$7^2\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{163}}^1$

素因数の和:281

約数の個数: 24

約数和(自身を含む): 25501344

約数和(自身を除く): 4551443

約数列:

[1, 7, 43, 49, 61, 163, 301, 427, 1141, 2107, 2623, 2989, 7009, 7987, 9943, 18361, 49063, 69601, 128527, 343441, 427549, 487207, 2992843, 20949901]

約数ペア:

[(1, 20949901), (7, 2992843), (43, 487207), (49, 427549), (61, 343441), (163, 128527), (301, 69601), (427, 49063), (1141, 18361), (2107, 9943), (2623, 7987), (2989, 7009)]