21075145

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^2\times {\mathrm{509}}^1$

素因数の和:554

約数の個数: 36

約数和(自身を含む): 31918860

約数和(自身を除く): 10843715

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 169, 245, 455, 509, 637, 845, 1183, 2545, 3185, 3563, 5915, 6617, 8281, 17815, 24941, 33085, 41405, 46319, 86021, 124705, 231595, 324233, 430105, 602147, 1621165, 3010735, 4215029, 21075145]

約数ペア:

[(1, 21075145), (5, 4215029), (7, 3010735), (13, 1621165), (35, 602147), (49, 430105), (65, 324233), (91, 231595), (169, 124705), (245, 86021), (455, 46319), (509, 41405), (637, 33085), (845, 24941), (1183, 17815), (2545, 8281), (3185, 6617), (3563, 5915)]