20857991

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{269}}^1$

素因数の和:359

約数の個数: 32

約数和(自身を含む): 27993600

約数和(自身を除く): 7135609

約数列:

[1, 7, 11, 19, 53, 77, 133, 209, 269, 371, 583, 1007, 1463, 1883, 2959, 4081, 5111, 7049, 11077, 14257, 20713, 35777, 56221, 77539, 99799, 156827, 270883, 393547, 1097789, 1896181, 2979713, 20857991]

約数ペア:

[(1, 20857991), (7, 2979713), (11, 1896181), (19, 1097789), (53, 393547), (77, 270883), (133, 156827), (209, 99799), (269, 77539), (371, 56221), (583, 35777), (1007, 20713), (1463, 14257), (1883, 11077), (2959, 7049), (4081, 5111)]