19910891

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{19891}}^1$

素因数の和:19922

約数の個数: 16

約数和(自身を含む): 26734848

約数和(自身を除く): 6823957

約数列:

[1, 7, 11, 13, 77, 91, 143, 1001, 19891, 139237, 218801, 258583, 1531607, 1810081, 2844413, 19910891]

約数ペア:

[(1, 19910891), (7, 2844413), (11, 1810081), (13, 1531607), (77, 258583), (91, 218801), (143, 139237), (1001, 19891)]