20978867

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{191}}^1$

素因数の和:299

約数の個数: 32

約数和(自身を含む): 27869184

約数和(自身を除く): 6890317

約数列:

[1, 7, 13, 17, 71, 91, 119, 191, 221, 497, 923, 1207, 1337, 1547, 2483, 3247, 6461, 8449, 13561, 15691, 17381, 22729, 42211, 94927, 109837, 176293, 230537, 295477, 1234051, 1613759, 2996981, 20978867]

約数ペア:

[(1, 20978867), (7, 2996981), (13, 1613759), (17, 1234051), (71, 295477), (91, 230537), (119, 176293), (191, 109837), (221, 94927), (497, 42211), (923, 22729), (1207, 17381), (1337, 15691), (1547, 13561), (2483, 8449), (3247, 6461)]