1991115

素因数分解:

$3^3\times 5^1\times 7^3\times {\mathrm{43}}^1$

素因数の和:78

約数の個数: 64

約数和(自身を含む): 4224000

約数和(自身を除く): 2232885

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 43, 45, 49, 63, 105, 129, 135, 147, 189, 215, 245, 301, 315, 343, 387, 441, 645, 735, 903, 945, 1029, 1161, 1323, 1505, 1715, 1935, 2107, 2205, 2709, 3087, 4515, 5145, 5805, 6321, 6615, 8127, 9261, 10535, 13545, 14749, 15435, 18963, 31605, 40635, 44247, 46305, 56889, 73745, 94815, 132741, 221235, 284445, 398223, 663705, 1991115]

約数ペア:

[(1, 1991115), (3, 663705), (5, 398223), (7, 284445), (9, 221235), (15, 132741), (21, 94815), (27, 73745), (35, 56889), (43, 46305), (45, 44247), (49, 40635), (63, 31605), (105, 18963), (129, 15435), (135, 14749), (147, 13545), (189, 10535), (215, 9261), (245, 8127), (301, 6615), (315, 6321), (343, 5805), (387, 5145), (441, 4515), (645, 3087), (735, 2709), (903, 2205), (945, 2107), (1029, 1935), (1161, 1715), (1323, 1505)]