21386799

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1051}}^1$

素因数の和:1100

約数の個数: 48

約数和(自身を含む): 39386880

約数和(自身を除く): 18000081

約数列:

[1, 3, 7, 9, 17, 19, 21, 51, 57, 63, 119, 133, 153, 171, 323, 357, 399, 969, 1051, 1071, 1197, 2261, 2907, 3153, 6783, 7357, 9459, 17867, 19969, 20349, 22071, 53601, 59907, 66213, 125069, 139783, 160803, 179721, 339473, 375207, 419349, 1018419, 1125621, 1258047, 2376311, 3055257, 7128933, 21386799]

約数ペア:

[(1, 21386799), (3, 7128933), (7, 3055257), (9, 2376311), (17, 1258047), (19, 1125621), (21, 1018419), (51, 419349), (57, 375207), (63, 339473), (119, 179721), (133, 160803), (153, 139783), (171, 125069), (323, 66213), (357, 59907), (399, 53601), (969, 22071), (1051, 20349), (1071, 19969), (1197, 17867), (2261, 9459), (2907, 7357), (3153, 6783)]