20978157

素因数分解:

$3^1\times {\mathrm{71}}^1\times {\mathrm{149}}^1\times {\mathrm{661}}^1$

素因数の和:884

約数の個数: 16

約数和(自身を含む): 28598400

約数和(自身を除く): 7620243

約数列:

[1, 3, 71, 149, 213, 447, 661, 1983, 10579, 31737, 46931, 98489, 140793, 295467, 6992719, 20978157]

約数ペア:

[(1, 20978157), (3, 6992719), (71, 295467), (149, 140793), (213, 98489), (447, 46931), (661, 31737), (1983, 10579)]