21387825

素因数分解:

$3^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{5003}}^1$

素因数の和:5038

約数の個数: 36

約数和(自身を含む): 40332240

約数和(自身を除く): 18944415

約数列:

[1, 3, 5, 9, 15, 19, 25, 45, 57, 75, 95, 171, 225, 285, 475, 855, 1425, 4275, 5003, 15009, 25015, 45027, 75045, 95057, 125075, 225135, 285171, 375225, 475285, 855513, 1125675, 1425855, 2376425, 4277565, 7129275, 21387825]

約数ペア:

[(1, 21387825), (3, 7129275), (5, 4277565), (9, 2376425), (15, 1425855), (19, 1125675), (25, 855513), (45, 475285), (57, 375225), (75, 285171), (95, 225135), (171, 125075), (225, 95057), (285, 75045), (475, 45027), (855, 25015), (1425, 15009), (4275, 5003)]