21787857

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{719}}^1$

素因数の和:782

約数の個数: 48

約数和(自身を含む): 39836160

約数和(自身を除く): 18048303

約数列:

[1, 3, 7, 9, 13, 21, 37, 39, 63, 91, 111, 117, 259, 273, 333, 481, 719, 777, 819, 1443, 2157, 2331, 3367, 4329, 5033, 6471, 9347, 10101, 15099, 26603, 28041, 30303, 45297, 65429, 79809, 84123, 186221, 196287, 239427, 345839, 558663, 588861, 1037517, 1675989, 2420873, 3112551, 7262619, 21787857]

約数ペア:

[(1, 21787857), (3, 7262619), (7, 3112551), (9, 2420873), (13, 1675989), (21, 1037517), (37, 588861), (39, 558663), (63, 345839), (91, 239427), (111, 196287), (117, 186221), (259, 84123), (273, 79809), (333, 65429), (481, 45297), (719, 30303), (777, 28041), (819, 26603), (1443, 15099), (2157, 10101), (2331, 9347), (3367, 6471), (4329, 5033)]