21354879

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{179}}^1$

素因数の和:244

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 17352321

約数列:

[1, 3, 7, 13, 19, 21, 23, 39, 57, 69, 91, 133, 161, 179, 247, 273, 299, 399, 437, 483, 537, 741, 897, 1253, 1311, 1729, 2093, 2327, 3059, 3401, 3759, 4117, 5187, 5681, 6279, 6981, 9177, 10203, 12351, 16289, 17043, 23807, 28819, 39767, 44213, 48867, 53521, 71421, 78223, 86457, 119301, 132639, 160563, 234669, 309491, 374647, 547561, 928473, 1016899, 1123941, 1642683, 3050697, 7118293, 21354879]

約数ペア:

[(1, 21354879), (3, 7118293), (7, 3050697), (13, 1642683), (19, 1123941), (21, 1016899), (23, 928473), (39, 547561), (57, 374647), (69, 309491), (91, 234669), (133, 160563), (161, 132639), (179, 119301), (247, 86457), (273, 78223), (299, 71421), (399, 53521), (437, 48867), (483, 44213), (537, 39767), (741, 28819), (897, 23807), (1253, 17043), (1311, 16289), (1729, 12351), (2093, 10203), (2327, 9177), (3059, 6981), (3401, 6279), (3759, 5681), (4117, 5187)]