20640465

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{26981}}^1$

素因数の和:27009

約数の個数: 24

約数和(自身を含む): 37882728

約数和(自身を除く): 17242263

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 26981, 80943, 134905, 242829, 404715, 458677, 1214145, 1376031, 2293385, 4128093, 6880155, 20640465]

約数ペア:

[(1, 20640465), (3, 6880155), (5, 4128093), (9, 2293385), (15, 1376031), (17, 1214145), (45, 458677), (51, 404715), (85, 242829), (153, 134905), (255, 80943), (765, 26981)]