21491869

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{283}}^1\times {\mathrm{571}}^1$

素因数の和:880

約数の個数: 16

約数和(自身を含む): 25991680

約数和(自身を除く): 4499811

約数列:

[1, 7, 19, 133, 283, 571, 1981, 3997, 5377, 10849, 37639, 75943, 161593, 1131151, 3070267, 21491869]

約数ペア:

[(1, 21491869), (7, 3070267), (19, 1131151), (133, 161593), (283, 75943), (571, 37639), (1981, 10849), (3997, 5377)]