21807009

素因数分解:

$3^3\times 7^2\times {\mathrm{53}}^1\times {\mathrm{311}}^1$

素因数の和:387

約数の個数: 48

約数和(自身を含む): 38413440

約数和(自身を除く): 16606431

約数列:

[1, 3, 7, 9, 21, 27, 49, 53, 63, 147, 159, 189, 311, 371, 441, 477, 933, 1113, 1323, 1431, 2177, 2597, 2799, 3339, 6531, 7791, 8397, 10017, 15239, 16483, 19593, 23373, 45717, 49449, 58779, 70119, 115381, 137151, 148347, 346143, 411453, 445041, 807667, 1038429, 2423001, 3115287, 7269003, 21807009]

約数ペア:

[(1, 21807009), (3, 7269003), (7, 3115287), (9, 2423001), (21, 1038429), (27, 807667), (49, 445041), (53, 411453), (63, 346143), (147, 148347), (159, 137151), (189, 115381), (311, 70119), (371, 58779), (441, 49449), (477, 45717), (933, 23373), (1113, 19593), (1323, 16483), (1431, 15239), (2177, 10017), (2597, 8397), (2799, 7791), (3339, 6531)]