20720721

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{18617}}^1$

素因数の和:18680

約数の個数: 16

約数和(自身を含む): 32171904

約数和(自身を除く): 11451183

約数列:

[1, 3, 7, 21, 53, 159, 371, 1113, 18617, 55851, 130319, 390957, 986701, 2960103, 6906907, 20720721]

約数ペア:

[(1, 20720721), (3, 6906907), (7, 2960103), (21, 986701), (53, 390957), (159, 130319), (371, 55851), (1113, 18617)]