81291021

素因数分解:

$3^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{193}}^1\times {\mathrm{647}}^1$

素因数の和:881

約数の個数: 32

約数和(自身を含む): 128729088

約数和(自身を除く): 47438067

約数列:

[1, 3, 7, 21, 31, 93, 193, 217, 579, 647, 651, 1351, 1941, 4053, 4529, 5983, 13587, 17949, 20057, 41881, 60171, 124871, 125643, 140399, 374613, 421197, 874097, 2622291, 3871001, 11613003, 27097007, 81291021]

約数ペア:

[(1, 81291021), (3, 27097007), (7, 11613003), (21, 3871001), (31, 2622291), (93, 874097), (193, 421197), (217, 374613), (579, 140399), (647, 125643), (651, 124871), (1351, 60171), (1941, 41881), (4053, 20057), (4529, 17949), (5983, 13587)]