20989815

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{1069}}^1$

素因数の和:1112

約数の個数: 64

約数和(自身を含む): 44375040

約数和(自身を除く): 23385225

約数列:

[1, 3, 5, 7, 11, 15, 17, 21, 33, 35, 51, 55, 77, 85, 105, 119, 165, 187, 231, 255, 357, 385, 561, 595, 935, 1069, 1155, 1309, 1785, 2805, 3207, 3927, 5345, 6545, 7483, 11759, 16035, 18173, 19635, 22449, 35277, 37415, 54519, 58795, 82313, 90865, 112245, 127211, 176385, 199903, 246939, 272595, 381633, 411565, 599709, 636055, 999515, 1234695, 1399321, 1908165, 2998545, 4197963, 6996605, 20989815]

約数ペア:

[(1, 20989815), (3, 6996605), (5, 4197963), (7, 2998545), (11, 1908165), (15, 1399321), (17, 1234695), (21, 999515), (33, 636055), (35, 599709), (51, 411565), (55, 381633), (77, 272595), (85, 246939), (105, 199903), (119, 176385), (165, 127211), (187, 112245), (231, 90865), (255, 82313), (357, 58795), (385, 54519), (561, 37415), (595, 35277), (935, 22449), (1069, 19635), (1155, 18173), (1309, 16035), (1785, 11759), (2805, 7483), (3207, 6545), (3927, 5345)]