21009645

素因数分解:

$3^3\times 5^1\times {\mathrm{155627}}^1$

素因数の和:155641

約数の個数: 16

約数和(自身を含む): 37350720

約数和(自身を除く): 16341075

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 155627, 466881, 778135, 1400643, 2334405, 4201929, 7003215, 21009645]

約数ペア:

[(1, 21009645), (3, 7003215), (5, 4201929), (9, 2334405), (15, 1400643), (27, 778135), (45, 466881), (135, 155627)]