21637889

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{197}}^1$

素因数の和:305

約数の個数: 32

約数和(自身を含む): 28740096

約数和(自身を除く): 7102207

約数列:

[1, 7, 13, 17, 71, 91, 119, 197, 221, 497, 923, 1207, 1379, 1547, 2561, 3349, 6461, 8449, 13987, 15691, 17927, 23443, 43537, 97909, 109837, 181831, 237779, 304759, 1272817, 1664453, 3091127, 21637889]

約数ペア:

[(1, 21637889), (7, 3091127), (13, 1664453), (17, 1272817), (71, 304759), (91, 237779), (119, 181831), (197, 109837), (221, 97909), (497, 43537), (923, 23443), (1207, 17927), (1379, 15691), (1547, 13987), (2561, 8449), (3349, 6461)]