20780991

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{157}}^1\times {\mathrm{191}}^1$

素因数の和:372

約数の個数: 48

約数和(自身を含む): 37859328

約数和(自身を除く): 17078337

約数列:

[1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 157, 191, 231, 471, 573, 693, 1099, 1337, 1413, 1719, 1727, 2101, 3297, 4011, 5181, 6303, 9891, 12033, 12089, 14707, 15543, 18909, 29987, 36267, 44121, 89961, 108801, 132363, 209909, 269883, 329857, 629727, 989571, 1889181, 2308999, 2968713, 6926997, 20780991]

約数ペア:

[(1, 20780991), (3, 6926997), (7, 2968713), (9, 2308999), (11, 1889181), (21, 989571), (33, 629727), (63, 329857), (77, 269883), (99, 209909), (157, 132363), (191, 108801), (231, 89961), (471, 44121), (573, 36267), (693, 29987), (1099, 18909), (1337, 15543), (1413, 14707), (1719, 12089), (1727, 12033), (2101, 9891), (3297, 6303), (4011, 5181)]