20909745

素因数分解:

$3^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{3037}}^1$

素因数の和:3071

約数の個数: 40

約数和(自身を含む): 39700584

約数和(自身を除く): 18790839

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 255, 405, 459, 765, 1377, 2295, 3037, 6885, 9111, 15185, 27333, 45555, 51629, 81999, 136665, 154887, 245997, 258145, 409995, 464661, 774435, 1229985, 1393983, 2323305, 4181949, 6969915, 20909745]

約数ペア:

[(1, 20909745), (3, 6969915), (5, 4181949), (9, 2323305), (15, 1393983), (17, 1229985), (27, 774435), (45, 464661), (51, 409995), (81, 258145), (85, 245997), (135, 154887), (153, 136665), (255, 81999), (405, 51629), (459, 45555), (765, 27333), (1377, 15185), (2295, 9111), (3037, 6885)]