21000547645

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^2\times {\mathrm{281}}^1\times {\mathrm{2521}}^1$

素因数の和:2843

約数の個数: 72

約数和(自身を含む): 32349825144

約数和(自身を除く): 11349277499

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 121, 245, 281, 385, 539, 605, 847, 1405, 1967, 2521, 2695, 3091, 4235, 5929, 9835, 12605, 13769, 15455, 17647, 21637, 27731, 29645, 34001, 68845, 88235, 108185, 123529, 138655, 151459, 170005, 194117, 238007, 305041, 617645, 708401, 757295, 970585, 1190035, 1358819, 1525205, 1666049, 2135287, 3542005, 4958807, 6794095, 7792411, 8330245, 10676435, 14947009, 24794035, 34711649, 38962055, 54546877, 74735045, 85716521, 173558245, 272734385, 381828139, 428582605, 600015647, 1909140695, 3000078235, 4200109529, 21000547645]

約数ペア:

[(1, 21000547645), (5, 4200109529), (7, 3000078235), (11, 1909140695), (35, 600015647), (49, 428582605), (55, 381828139), (77, 272734385), (121, 173558245), (245, 85716521), (281, 74735045), (385, 54546877), (539, 38962055), (605, 34711649), (847, 24794035), (1405, 14947009), (1967, 10676435), (2521, 8330245), (2695, 7792411), (3091, 6794095), (4235, 4958807), (5929, 3542005), (9835, 2135287), (12605, 1666049), (13769, 1525205), (15455, 1358819), (17647, 1190035), (21637, 970585), (27731, 757295), (29645, 708401), (34001, 617645), (68845, 305041), (88235, 238007), (108185, 194117), (123529, 170005), (138655, 151459)]