21074781

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{239}}^1$

素因数の和:298

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 17632419

約数列:

[1, 3, 7, 13, 17, 19, 21, 39, 51, 57, 91, 119, 133, 221, 239, 247, 273, 323, 357, 399, 663, 717, 741, 969, 1547, 1673, 1729, 2261, 3107, 4063, 4199, 4541, 4641, 5019, 5187, 6783, 9321, 12189, 12597, 13623, 21749, 28441, 29393, 31787, 52819, 59033, 65247, 77197, 85323, 88179, 95361, 158457, 177099, 231591, 369733, 413231, 540379, 1003561, 1109199, 1239693, 1621137, 3010683, 7024927, 21074781]

約数ペア:

[(1, 21074781), (3, 7024927), (7, 3010683), (13, 1621137), (17, 1239693), (19, 1109199), (21, 1003561), (39, 540379), (51, 413231), (57, 369733), (91, 231591), (119, 177099), (133, 158457), (221, 95361), (239, 88179), (247, 85323), (273, 77197), (323, 65247), (357, 59033), (399, 52819), (663, 31787), (717, 29393), (741, 28441), (969, 21749), (1547, 13623), (1673, 12597), (1729, 12189), (2261, 9321), (3107, 6783), (4063, 5187), (4199, 5019), (4541, 4641)]