20178921

素因数分解:

$3^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{6449}}^1$

素因数の和:6608

約数の個数: 16

約数和(自身を含む): 30960000

約数和(自身を除く): 10781079

約数列:

[1, 3, 7, 21, 149, 447, 1043, 3129, 6449, 19347, 45143, 135429, 960901, 2882703, 6726307, 20178921]

約数ペア:

[(1, 20178921), (3, 6726307), (7, 2882703), (21, 960901), (149, 135429), (447, 45143), (1043, 19347), (3129, 6449)]