20781180

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16493}}^1$

素因数の和:16515

約数の個数: 72

約数和(自身を含む): 72045792

約数和(自身を除く): 51264612

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16493, 32986, 49479, 65972, 82465, 98958, 115451, 148437, 164930, 197916, 230902, 247395, 296874, 329860, 346353, 461804, 494790, 577255, 593748, 692706, 742185, 989580, 1039059, 1154510, 1385412, 1484370, 1731765, 2078118, 2309020, 2968740, 3463530, 4156236, 5195295, 6927060, 10390590, 20781180]

約数ペア:

[(1, 20781180), (2, 10390590), (3, 6927060), (4, 5195295), (5, 4156236), (6, 3463530), (7, 2968740), (9, 2309020), (10, 2078118), (12, 1731765), (14, 1484370), (15, 1385412), (18, 1154510), (20, 1039059), (21, 989580), (28, 742185), (30, 692706), (35, 593748), (36, 577255), (42, 494790), (45, 461804), (60, 346353), (63, 329860), (70, 296874), (84, 247395), (90, 230902), (105, 197916), (126, 164930), (140, 148437), (180, 115451), (210, 98958), (252, 82465), (315, 65972), (420, 49479), (630, 32986), (1260, 16493)]