21380805

素因数分解:

$3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{7789}}^1$

素因数の和:7861

約数の個数: 24

約数和(自身を含む): 37672440

約数和(自身を除く): 16291635

約数列:

[1, 3, 5, 9, 15, 45, 61, 183, 305, 549, 915, 2745, 7789, 23367, 38945, 70101, 116835, 350505, 475129, 1425387, 2375645, 4276161, 7126935, 21380805]

約数ペア:

[(1, 21380805), (3, 7126935), (5, 4276161), (9, 2375645), (15, 1425387), (45, 475129), (61, 350505), (183, 116835), (305, 70101), (549, 38945), (915, 23367), (2745, 7789)]