21387855

素因数分解:

$3^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{83}}^1\times {\mathrm{419}}^1$

素因数の和:551

約数の個数: 32

約数和(自身を含む): 35562240

約数和(自身を除く): 14174385

約数列:

[1, 3, 5, 15, 41, 83, 123, 205, 249, 415, 419, 615, 1245, 1257, 2095, 3403, 6285, 10209, 17015, 17179, 34777, 51045, 51537, 85895, 104331, 173885, 257685, 521655, 1425857, 4277571, 7129285, 21387855]

約数ペア:

[(1, 21387855), (3, 7129285), (5, 4277571), (15, 1425857), (41, 521655), (83, 257685), (123, 173885), (205, 104331), (249, 85895), (415, 51537), (419, 51045), (615, 34777), (1245, 17179), (1257, 17015), (2095, 10209), (3403, 6285)]