21252868

素因数分解:

$2^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{439}}^1$

素因数の和:489

約数の個数: 72

約数和(自身を含む): 49156800

約数和(自身を除く): 27903932

約数列:

[1, 2, 4, 7, 13, 14, 19, 26, 28, 38, 49, 52, 76, 91, 98, 133, 182, 196, 247, 266, 364, 439, 494, 532, 637, 878, 931, 988, 1274, 1729, 1756, 1862, 2548, 3073, 3458, 3724, 5707, 6146, 6916, 8341, 11414, 12103, 12292, 16682, 21511, 22828, 24206, 33364, 39949, 43022, 48412, 58387, 79898, 86044, 108433, 116774, 159796, 216866, 233548, 279643, 408709, 433732, 559286, 759031, 817418, 1118572, 1518062, 1634836, 3036124, 5313217, 10626434, 21252868]

約数ペア:

[(1, 21252868), (2, 10626434), (4, 5313217), (7, 3036124), (13, 1634836), (14, 1518062), (19, 1118572), (26, 817418), (28, 759031), (38, 559286), (49, 433732), (52, 408709), (76, 279643), (91, 233548), (98, 216866), (133, 159796), (182, 116774), (196, 108433), (247, 86044), (266, 79898), (364, 58387), (439, 48412), (494, 43022), (532, 39949), (637, 33364), (878, 24206), (931, 22828), (988, 21511), (1274, 16682), (1729, 12292), (1756, 12103), (1862, 11414), (2548, 8341), (3073, 6916), (3458, 6146), (3724, 5707)]