21215425

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{107}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 33426432

約数和(自身を除く): 12211007

約数列:

[1, 5, 7, 11, 25, 35, 55, 77, 103, 107, 175, 275, 385, 515, 535, 721, 749, 1133, 1177, 1925, 2575, 2675, 3605, 3745, 5665, 5885, 7931, 8239, 11021, 18025, 18725, 28325, 29425, 39655, 41195, 55105, 77147, 121231, 198275, 205975, 275525, 385735, 606155, 848617, 1928675, 3030775, 4243085, 21215425]

約数ペア:

[(1, 21215425), (5, 4243085), (7, 3030775), (11, 1928675), (25, 848617), (35, 606155), (55, 385735), (77, 275525), (103, 205975), (107, 198275), (175, 121231), (275, 77147), (385, 55105), (515, 41195), (535, 39655), (721, 29425), (749, 28325), (1133, 18725), (1177, 18025), (1925, 11021), (2575, 8239), (2675, 7931), (3605, 5885), (3745, 5665)]