20657655

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{653}}^1$

素因数の和:720

約数の個数: 48

約数和(自身を含む): 38769120

約数和(自身を除く): 18111465

約数列:

[1, 3, 5, 9, 15, 19, 37, 45, 57, 95, 111, 171, 185, 285, 333, 555, 653, 703, 855, 1665, 1959, 2109, 3265, 3515, 5877, 6327, 9795, 10545, 12407, 24161, 29385, 31635, 37221, 62035, 72483, 111663, 120805, 186105, 217449, 362415, 459059, 558315, 1087245, 1377177, 2295295, 4131531, 6885885, 20657655]

約数ペア:

[(1, 20657655), (3, 6885885), (5, 4131531), (9, 2295295), (15, 1377177), (19, 1087245), (37, 558315), (45, 459059), (57, 362415), (95, 217449), (111, 186105), (171, 120805), (185, 111663), (285, 72483), (333, 62035), (555, 37221), (653, 31635), (703, 29385), (855, 24161), (1665, 12407), (1959, 10545), (2109, 9795), (3265, 6327), (3515, 5877)]