21780495

素因数分解:

$3^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{4889}}^1$

素因数の和:4917

約数の個数: 40

約数和(自身を含む): 42601680

約数和(自身を除く): 20821185

約数列:

[1, 3, 5, 9, 11, 15, 27, 33, 45, 55, 81, 99, 135, 165, 297, 405, 495, 891, 1485, 4455, 4889, 14667, 24445, 44001, 53779, 73335, 132003, 161337, 220005, 268895, 396009, 484011, 660015, 806685, 1452033, 1980045, 2420055, 4356099, 7260165, 21780495]

約数ペア:

[(1, 21780495), (3, 7260165), (5, 4356099), (9, 2420055), (11, 1980045), (15, 1452033), (27, 806685), (33, 660015), (45, 484011), (55, 396009), (81, 268895), (99, 220005), (135, 161337), (165, 132003), (297, 73335), (405, 53779), (495, 44001), (891, 24445), (1485, 14667), (4455, 4889)]