21990265

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{811}}^1$

素因数の和:873

約数の個数: 32

約数和(自身を含む): 31570560

約数和(自身を除く): 9580295

約数列:

[1, 5, 11, 17, 29, 55, 85, 145, 187, 319, 493, 811, 935, 1595, 2465, 4055, 5423, 8921, 13787, 23519, 27115, 44605, 68935, 117595, 151657, 258709, 399823, 758285, 1293545, 1999115, 4398053, 21990265]

約数ペア:

[(1, 21990265), (5, 4398053), (11, 1999115), (17, 1293545), (29, 758285), (55, 399823), (85, 258709), (145, 151657), (187, 117595), (319, 68935), (493, 44605), (811, 27115), (935, 23519), (1595, 13787), (2465, 8921), (4055, 5423)]