21156291

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{307}}^1$

素因数の和:376

約数の個数: 48

約数和(自身を含む): 35875840

約数和(自身を除く): 14719549

約数列:

[1, 3, 9, 13, 19, 31, 39, 57, 93, 117, 171, 247, 279, 307, 403, 589, 741, 921, 1209, 1767, 2223, 2763, 3627, 3991, 5301, 5833, 7657, 9517, 11973, 17499, 22971, 28551, 35919, 52497, 68913, 75829, 85653, 123721, 180823, 227487, 371163, 542469, 682461, 1113489, 1627407, 2350699, 7052097, 21156291]

約数ペア:

[(1, 21156291), (3, 7052097), (9, 2350699), (13, 1627407), (19, 1113489), (31, 682461), (39, 542469), (57, 371163), (93, 227487), (117, 180823), (171, 123721), (247, 85653), (279, 75829), (307, 68913), (403, 52497), (589, 35919), (741, 28551), (921, 22971), (1209, 17499), (1767, 11973), (2223, 9517), (2763, 7657), (3627, 5833), (3991, 5301)]