21641781

素因数分解:

$3^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{173}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 36180864

約数和(自身を除く): 14539083

約数列:

[1, 3, 7, 21, 23, 37, 49, 69, 111, 147, 161, 173, 259, 483, 519, 777, 851, 1127, 1211, 1813, 2553, 3381, 3633, 3979, 5439, 5957, 6401, 8477, 11937, 17871, 19203, 25431, 27853, 41699, 44807, 83559, 125097, 134421, 147223, 194971, 313649, 441669, 584913, 940947, 1030561, 3091683, 7213927, 21641781]

約数ペア:

[(1, 21641781), (3, 7213927), (7, 3091683), (21, 1030561), (23, 940947), (37, 584913), (49, 441669), (69, 313649), (111, 194971), (147, 147223), (161, 134421), (173, 125097), (259, 83559), (483, 44807), (519, 41699), (777, 27853), (851, 25431), (1127, 19203), (1211, 17871), (1813, 11937), (2553, 8477), (3381, 6401), (3633, 5957), (3979, 5439)]