21378987

素因数分解:

$3^2\times 7^1\times {\mathrm{137}}^1\times {\mathrm{2477}}^1$

素因数の和:2627

約数の個数: 24

約数和(自身を含む): 35564256

約数和(自身を除く): 14185269

約数列:

[1, 3, 7, 9, 21, 63, 137, 411, 959, 1233, 2477, 2877, 7431, 8631, 17339, 22293, 52017, 156051, 339349, 1018047, 2375443, 3054141, 7126329, 21378987]

約数ペア:

[(1, 21378987), (3, 7126329), (7, 3054141), (9, 2375443), (21, 1018047), (63, 339349), (137, 156051), (411, 52017), (959, 22293), (1233, 17339), (2477, 8631), (2877, 7431)]