21208215

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{103}}^1$

素因数の和:208

約数の個数: 64

約数和(自身を含む): 40974336

約数和(自身を除く): 19766121

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 53, 103, 105, 111, 159, 185, 259, 265, 309, 371, 515, 555, 721, 777, 795, 1113, 1295, 1545, 1855, 1961, 2163, 3605, 3811, 3885, 5459, 5565, 5883, 9805, 10815, 11433, 13727, 16377, 19055, 26677, 27295, 29415, 38213, 41181, 57165, 68635, 80031, 81885, 114639, 133385, 191065, 201983, 205905, 400155, 573195, 605949, 1009915, 1413881, 3029745, 4241643, 7069405, 21208215]

約数ペア:

[(1, 21208215), (3, 7069405), (5, 4241643), (7, 3029745), (15, 1413881), (21, 1009915), (35, 605949), (37, 573195), (53, 400155), (103, 205905), (105, 201983), (111, 191065), (159, 133385), (185, 114639), (259, 81885), (265, 80031), (309, 68635), (371, 57165), (515, 41181), (555, 38213), (721, 29415), (777, 27295), (795, 26677), (1113, 19055), (1295, 16377), (1545, 13727), (1855, 11433), (1961, 10815), (2163, 9805), (3605, 5883), (3811, 5565), (3885, 5459)]