21380985

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{1471}}^1$

素因数の和:1518

約数の個数: 48

約数和(自身を含む): 41333760

約数和(自身を除く): 19952775

約数列:

[1, 3, 5, 9, 15, 17, 19, 45, 51, 57, 85, 95, 153, 171, 255, 285, 323, 765, 855, 969, 1471, 1615, 2907, 4413, 4845, 7355, 13239, 14535, 22065, 25007, 27949, 66195, 75021, 83847, 125035, 139745, 225063, 251541, 375105, 419235, 475133, 1125315, 1257705, 1425399, 2375665, 4276197, 7126995, 21380985]

約数ペア:

[(1, 21380985), (3, 7126995), (5, 4276197), (9, 2375665), (15, 1425399), (17, 1257705), (19, 1125315), (45, 475133), (51, 419235), (57, 375105), (85, 251541), (95, 225063), (153, 139745), (171, 125035), (255, 83847), (285, 75021), (323, 66195), (765, 27949), (855, 25007), (969, 22065), (1471, 14535), (1615, 13239), (2907, 7355), (4413, 4845)]