21503385

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28109}}^1$

素因数の和:28137

約数の個数: 24

約数和(自身を含む): 39466440

約数和(自身を除く): 17963055

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28109, 84327, 140545, 252981, 421635, 477853, 1264905, 1433559, 2389265, 4300677, 7167795, 21503385]

約数ペア:

[(1, 21503385), (3, 7167795), (5, 4300677), (9, 2389265), (15, 1433559), (17, 1264905), (45, 477853), (51, 421635), (85, 252981), (153, 140545), (255, 84327), (765, 28109)]