20947556

素因数分解:

$2^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{257}}^1$

素因数の和:380

約数の個数: 48

約数和(自身を含む): 43690752

約数和(自身を除く): 22743196

約数列:

[1, 2, 4, 7, 14, 28, 41, 71, 82, 142, 164, 257, 284, 287, 497, 514, 574, 994, 1028, 1148, 1799, 1988, 2911, 3598, 5822, 7196, 10537, 11644, 18247, 20377, 21074, 36494, 40754, 42148, 72988, 73759, 81508, 127729, 147518, 255458, 295036, 510916, 748127, 1496254, 2992508, 5236889, 10473778, 20947556]

約数ペア:

[(1, 20947556), (2, 10473778), (4, 5236889), (7, 2992508), (14, 1496254), (28, 748127), (41, 510916), (71, 295036), (82, 255458), (142, 147518), (164, 127729), (257, 81508), (284, 73759), (287, 72988), (497, 42148), (514, 40754), (574, 36494), (994, 21074), (1028, 20377), (1148, 18247), (1799, 11644), (1988, 10537), (2911, 7196), (3598, 5822)]