21381903

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:192

約数の個数: 48

約数和(自身を含む): 34819200

約数和(自身を除く): 13437297

約数列:

[1, 3, 9, 17, 29, 51, 61, 79, 87, 153, 183, 237, 261, 493, 549, 711, 1037, 1343, 1479, 1769, 2291, 3111, 4029, 4437, 4819, 5307, 6873, 9333, 12087, 14457, 15921, 20619, 30073, 38947, 43371, 81923, 90219, 116841, 139751, 245769, 270657, 350523, 419253, 737307, 1257759, 2375767, 7127301, 21381903]

約数ペア:

[(1, 21381903), (3, 7127301), (9, 2375767), (17, 1257759), (29, 737307), (51, 419253), (61, 350523), (79, 270657), (87, 245769), (153, 139751), (183, 116841), (237, 90219), (261, 81923), (493, 43371), (549, 38947), (711, 30073), (1037, 20619), (1343, 15921), (1479, 14457), (1769, 12087), (2291, 9333), (3111, 6873), (4029, 5307), (4437, 4819)]