21039987

素因数分解:

$3^1\times {\mathrm{73}}^1\times {\mathrm{191}}^1\times {\mathrm{503}}^1$

素因数の和:770

約数の個数: 16

約数和(自身を含む): 28643328

約数和(自身を除く): 7603341

約数列:

[1, 3, 73, 191, 219, 503, 573, 1509, 13943, 36719, 41829, 96073, 110157, 288219, 7013329, 21039987]

約数ペア:

[(1, 21039987), (3, 7013329), (73, 288219), (191, 110157), (219, 96073), (503, 41829), (573, 36719), (1509, 13943)]