21211551

素因数分解:

$3^4\times {\mathrm{307}}^1\times {\mathrm{853}}^1$

素因数の和:1172

約数の個数: 20

約数和(自身を含む): 31826872

約数和(自身を除く): 10615321

約数列:

[1, 3, 9, 27, 81, 307, 853, 921, 2559, 2763, 7677, 8289, 23031, 24867, 69093, 261871, 785613, 2356839, 7070517, 21211551]

約数ペア:

[(1, 21211551), (3, 7070517), (9, 2356839), (27, 785613), (81, 261871), (307, 69093), (853, 24867), (921, 23031), (2559, 8289), (2763, 7677)]