21780605

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{139}}^1$

素因数の和:210

約数の個数: 48

約数和(自身を含む): 33962880

約数和(自身を除く): 12182275

約数列:

[1, 5, 7, 11, 35, 37, 55, 77, 121, 139, 185, 259, 385, 407, 605, 695, 847, 973, 1295, 1529, 2035, 2849, 4235, 4477, 4865, 5143, 7645, 10703, 14245, 16819, 22385, 25715, 31339, 36001, 53515, 56573, 84095, 117733, 156695, 180005, 282865, 396011, 588665, 622303, 1980055, 3111515, 4356121, 21780605]

約数ペア:

[(1, 21780605), (5, 4356121), (7, 3111515), (11, 1980055), (35, 622303), (37, 588665), (55, 396011), (77, 282865), (121, 180005), (139, 156695), (185, 117733), (259, 84095), (385, 56573), (407, 53515), (605, 36001), (695, 31339), (847, 25715), (973, 22385), (1295, 16819), (1529, 14245), (2035, 10703), (2849, 7645), (4235, 5143), (4477, 4865)]