21705515

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{1511}}^1$

素因数の和:1559

約数の個数: 24

約数和(自身を含む): 29883168

約数和(自身を除く): 8177653

約数列:

[1, 5, 13, 17, 65, 85, 169, 221, 845, 1105, 1511, 2873, 7555, 14365, 19643, 25687, 98215, 128435, 255359, 333931, 1276795, 1669655, 4341103, 21705515]

約数ペア:

[(1, 21705515), (5, 4341103), (13, 1669655), (17, 1276795), (65, 333931), (85, 255359), (169, 128435), (221, 98215), (845, 25687), (1105, 19643), (1511, 14365), (2873, 7555)]