21373891

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{1997}}^1$

素因数の和:2154

約数の個数: 16

約数和(自身を含む): 26853120

約数和(自身を除く): 5479229

約数列:

[1, 7, 11, 77, 139, 973, 1529, 1997, 10703, 13979, 21967, 153769, 277583, 1943081, 3053413, 21373891]

約数ペア:

[(1, 21373891), (7, 3053413), (11, 1943081), (77, 277583), (139, 153769), (973, 21967), (1529, 13979), (1997, 10703)]