20639955

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{373}}^1$

素因数の和:436

約数の個数: 64

約数和(自身を含む): 41361408

約数和(自身を除く): 20721453

約数列:

[1, 3, 5, 7, 15, 17, 21, 31, 35, 51, 85, 93, 105, 119, 155, 217, 255, 357, 373, 465, 527, 595, 651, 1085, 1119, 1581, 1785, 1865, 2611, 2635, 3255, 3689, 5595, 6341, 7833, 7905, 11067, 11563, 13055, 18445, 19023, 31705, 34689, 39165, 44387, 55335, 57815, 80941, 95115, 133161, 173445, 196571, 221935, 242823, 404705, 589713, 665805, 982855, 1214115, 1375997, 2948565, 4127991, 6879985, 20639955]

約数ペア:

[(1, 20639955), (3, 6879985), (5, 4127991), (7, 2948565), (15, 1375997), (17, 1214115), (21, 982855), (31, 665805), (35, 589713), (51, 404705), (85, 242823), (93, 221935), (105, 196571), (119, 173445), (155, 133161), (217, 95115), (255, 80941), (357, 57815), (373, 55335), (465, 44387), (527, 39165), (595, 34689), (651, 31705), (1085, 19023), (1119, 18445), (1581, 13055), (1785, 11563), (1865, 11067), (2611, 7905), (2635, 7833), (3255, 6341), (3689, 5595)]