20996955

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{1307}}^1$

素因数の和:1345

約数の個数: 64

約数和(自身を含む): 45204480

約数和(自身を除く): 24207525

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 27, 35, 45, 51, 63, 85, 105, 119, 135, 153, 189, 255, 315, 357, 459, 595, 765, 945, 1071, 1307, 1785, 2295, 3213, 3921, 5355, 6535, 9149, 11763, 16065, 19605, 22219, 27447, 35289, 45745, 58815, 66657, 82341, 111095, 137235, 155533, 176445, 199971, 247023, 333285, 411705, 466599, 599913, 777665, 999855, 1235115, 1399797, 2332995, 2999565, 4199391, 6998985, 20996955]

約数ペア:

[(1, 20996955), (3, 6998985), (5, 4199391), (7, 2999565), (9, 2332995), (15, 1399797), (17, 1235115), (21, 999855), (27, 777665), (35, 599913), (45, 466599), (51, 411705), (63, 333285), (85, 247023), (105, 199971), (119, 176445), (135, 155533), (153, 137235), (189, 111095), (255, 82341), (315, 66657), (357, 58815), (459, 45745), (595, 35289), (765, 27447), (945, 22219), (1071, 19605), (1307, 16065), (1785, 11763), (2295, 9149), (3213, 6535), (3921, 5355)]