21686985

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28349}}^1$

素因数の和:28377

約数の個数: 24

約数和(自身を含む): 39803400

約数和(自身を除く): 18116415

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28349, 85047, 141745, 255141, 425235, 481933, 1275705, 1445799, 2409665, 4337397, 7228995, 21686985]

約数ペア:

[(1, 21686985), (3, 7228995), (5, 4337397), (9, 2409665), (15, 1445799), (17, 1275705), (45, 481933), (51, 425235), (85, 255141), (153, 141745), (255, 85047), (765, 28349)]