21456255

素因数分解:

$3^1\times 5^1\times {\mathrm{53}}^1\times {\mathrm{137}}^1\times {\mathrm{197}}^1$

素因数の和:395

約数の個数: 32

約数和(自身を含む): 35411904

約数和(自身を除く): 13955649

約数列:

[1, 3, 5, 15, 53, 137, 159, 197, 265, 411, 591, 685, 795, 985, 2055, 2955, 7261, 10441, 21783, 26989, 31323, 36305, 52205, 80967, 108915, 134945, 156615, 404835, 1430417, 4291251, 7152085, 21456255]

約数ペア:

[(1, 21456255), (3, 7152085), (5, 4291251), (15, 1430417), (53, 404835), (137, 156615), (159, 134945), (197, 108915), (265, 80967), (411, 52205), (591, 36305), (685, 31323), (795, 26989), (985, 21783), (2055, 10441), (2955, 7261)]