20718819

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{157}}^1$

素因数の和:248

約数の個数: 48

約数和(自身を含む): 34704384

約数和(自身を除く): 13985565

約数列:

[1, 3, 9, 11, 31, 33, 43, 93, 99, 129, 157, 279, 341, 387, 471, 473, 1023, 1333, 1413, 1419, 1727, 3069, 3999, 4257, 4867, 5181, 6751, 11997, 14601, 14663, 15543, 20253, 43803, 43989, 53537, 60759, 74261, 131967, 160611, 209281, 222783, 481833, 627843, 668349, 1883529, 2302091, 6906273, 20718819]

約数ペア:

[(1, 20718819), (3, 6906273), (9, 2302091), (11, 1883529), (31, 668349), (33, 627843), (43, 481833), (93, 222783), (99, 209281), (129, 160611), (157, 131967), (279, 74261), (341, 60759), (387, 53537), (471, 43989), (473, 43803), (1023, 20253), (1333, 15543), (1413, 14663), (1419, 14601), (1727, 11997), (3069, 6751), (3999, 5181), (4257, 4867)]