21209979

素因数分解:

$3^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{43913}}^1$

素因数の和:43946

約数の個数: 16

約数和(自身を含む): 33725952

約数和(自身を除く): 12515973

約数列:

[1, 3, 7, 21, 23, 69, 161, 483, 43913, 131739, 307391, 922173, 1009999, 3029997, 7069993, 21209979]

約数ペア:

[(1, 21209979), (3, 7069993), (7, 3029997), (21, 1009999), (23, 922173), (69, 307391), (161, 131739), (483, 43913)]