21981213

素因数分解:

$3^4\times {\mathrm{43}}^1\times {\mathrm{6311}}^1$

素因数の和:6366

約数の個数: 20

約数和(自身を含む): 33605088

約数和(自身を除く): 11623875

約数列:

[1, 3, 9, 27, 43, 81, 129, 387, 1161, 3483, 6311, 18933, 56799, 170397, 271373, 511191, 814119, 2442357, 7327071, 21981213]

約数ペア:

[(1, 21981213), (3, 7327071), (9, 2442357), (27, 814119), (43, 511191), (81, 271373), (129, 170397), (387, 56799), (1161, 18933), (3483, 6311)]