21818881

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{2557}}^1$

素因数の和:2640

約数の個数: 16

約数和(自身を含む): 26521344

約数和(自身を除く): 4702463

約数列:

[1, 7, 23, 53, 161, 371, 1219, 2557, 8533, 17899, 58811, 135521, 411677, 948647, 3116983, 21818881]

約数ペア:

[(1, 21818881), (7, 3116983), (23, 948647), (53, 411677), (161, 135521), (371, 58811), (1219, 17899), (2557, 8533)]