19781489

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{673}}^1$

素因数の和:729

約数の個数: 32

約数和(自身を含む): 27175680

約数和(自身を除く): 7394191

約数列:

[1, 7, 13, 17, 19, 91, 119, 133, 221, 247, 323, 673, 1547, 1729, 2261, 4199, 4711, 8749, 11441, 12787, 29393, 61243, 80087, 89509, 148733, 166231, 217379, 1041131, 1163617, 1521653, 2825927, 19781489]

約数ペア:

[(1, 19781489), (7, 2825927), (13, 1521653), (17, 1163617), (19, 1041131), (91, 217379), (119, 166231), (133, 148733), (221, 89509), (247, 80087), (323, 61243), (673, 29393), (1547, 12787), (1729, 11441), (2261, 8749), (4199, 4711)]