21081333

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1$

素因数の和:154

約数の個数: 64

約数和(自身を含む): 37158912

約数和(自身を除く): 16077579

約数列:

[1, 3, 7, 13, 21, 31, 39, 47, 53, 91, 93, 141, 159, 217, 273, 329, 371, 403, 611, 651, 689, 987, 1113, 1209, 1457, 1643, 1833, 2067, 2491, 2821, 4277, 4371, 4823, 4929, 7473, 8463, 10199, 11501, 12831, 14469, 17437, 18941, 21359, 30597, 32383, 34503, 52311, 56823, 64077, 77221, 97149, 132587, 149513, 226681, 231663, 397761, 448539, 540547, 680043, 1003873, 1621641, 3011619, 7027111, 21081333]

約数ペア:

[(1, 21081333), (3, 7027111), (7, 3011619), (13, 1621641), (21, 1003873), (31, 680043), (39, 540547), (47, 448539), (53, 397761), (91, 231663), (93, 226681), (141, 149513), (159, 132587), (217, 97149), (273, 77221), (329, 64077), (371, 56823), (403, 52311), (611, 34503), (651, 32383), (689, 30597), (987, 21359), (1113, 18941), (1209, 17437), (1457, 14469), (1643, 12831), (1833, 11501), (2067, 10199), (2491, 8463), (2821, 7473), (4277, 4929), (4371, 4823)]