21987105

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{209401}}^1$

素因数の和:209416

約数の個数: 16

約数和(自身を含む): 40205184

約数和(自身を除く): 18218079

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 209401, 628203, 1047005, 1465807, 3141015, 4397421, 7329035, 21987105]

約数ペア:

[(1, 21987105), (3, 7329035), (5, 4397421), (7, 3141015), (15, 1465807), (21, 1047005), (35, 628203), (105, 209401)]