21191751

素因数分解:

$3^2\times 7^1\times {\mathrm{263}}^1\times {\mathrm{1279}}^1$

素因数の和:1555

約数の個数: 24

約数和(自身を含む): 35143680

約数和(自身を除く): 13951929

約数列:

[1, 3, 7, 9, 21, 63, 263, 789, 1279, 1841, 2367, 3837, 5523, 8953, 11511, 16569, 26859, 80577, 336377, 1009131, 2354639, 3027393, 7063917, 21191751]

約数ペア:

[(1, 21191751), (3, 7063917), (7, 3027393), (9, 2354639), (21, 1009131), (63, 336377), (263, 80577), (789, 26859), (1279, 16569), (1841, 11511), (2367, 8953), (3837, 5523)]