20657845

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{389}}^1$

素因数の和:469

約数の個数: 32

約数和(自身を含む): 28828800

約数和(自身を除く): 8170955

約数列:

[1, 5, 13, 19, 43, 65, 95, 215, 247, 389, 559, 817, 1235, 1945, 2795, 4085, 5057, 7391, 10621, 16727, 25285, 36955, 53105, 83635, 96083, 217451, 317813, 480415, 1087255, 1589065, 4131569, 20657845]

約数ペア:

[(1, 20657845), (5, 4131569), (13, 1589065), (19, 1087255), (43, 480415), (65, 317813), (95, 217451), (215, 96083), (247, 83635), (389, 53105), (559, 36955), (817, 25285), (1235, 16727), (1945, 10621), (2795, 7391), (4085, 5057)]