21728343

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1$

素因数の和:172

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 16978857

約数列:

[1, 3, 7, 13, 19, 21, 39, 57, 59, 71, 91, 133, 177, 213, 247, 273, 399, 413, 497, 741, 767, 923, 1121, 1239, 1349, 1491, 1729, 2301, 2769, 3363, 4047, 4189, 5187, 5369, 6461, 7847, 9443, 12567, 14573, 16107, 17537, 19383, 23541, 28329, 29323, 43719, 52611, 54457, 79591, 87969, 102011, 122759, 163371, 238773, 306033, 368277, 381199, 557137, 1034683, 1143597, 1671411, 3104049, 7242781, 21728343]

約数ペア:

[(1, 21728343), (3, 7242781), (7, 3104049), (13, 1671411), (19, 1143597), (21, 1034683), (39, 557137), (57, 381199), (59, 368277), (71, 306033), (91, 238773), (133, 163371), (177, 122759), (213, 102011), (247, 87969), (273, 79591), (399, 54457), (413, 52611), (497, 43719), (741, 29323), (767, 28329), (923, 23541), (1121, 19383), (1239, 17537), (1349, 16107), (1491, 14573), (1729, 12567), (2301, 9443), (2769, 7847), (3363, 6461), (4047, 5369), (4189, 5187)]