20681375

素因数分解:

$5^3\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{89}}^1$

素因数の和:141

約数の個数: 48

約数和(自身を含む): 30831840

約数和(自身を除く): 10150465

約数列:

[1, 5, 11, 13, 25, 55, 65, 89, 125, 143, 169, 275, 325, 445, 715, 845, 979, 1157, 1375, 1625, 1859, 2225, 3575, 4225, 4895, 5785, 9295, 11125, 12727, 15041, 17875, 21125, 24475, 28925, 46475, 63635, 75205, 122375, 144625, 165451, 232375, 318175, 376025, 827255, 1590875, 1880125, 4136275, 20681375]

約数ペア:

[(1, 20681375), (5, 4136275), (11, 1880125), (13, 1590875), (25, 827255), (55, 376025), (65, 318175), (89, 232375), (125, 165451), (143, 144625), (169, 122375), (275, 75205), (325, 63635), (445, 46475), (715, 28925), (845, 24475), (979, 21125), (1157, 17875), (1375, 15041), (1625, 12727), (1859, 11125), (2225, 9295), (3575, 5785), (4225, 4895)]