21420561

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{263}}^1\times {\mathrm{1597}}^1$

素因数の和:1880

約数の個数: 16

約数和(自身を含む): 30374784

約数和(自身を除く): 8954223

約数列:

[1, 3, 17, 51, 263, 789, 1597, 4471, 4791, 13413, 27149, 81447, 420011, 1260033, 7140187, 21420561]

約数ペア:

[(1, 21420561), (3, 7140187), (17, 1260033), (51, 420011), (263, 81447), (789, 27149), (1597, 13413), (4471, 4791)]