21291578

素因数分解:

$2^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{19751}}^1$

素因数の和:19778

約数の個数: 24

約数和(自身を含む): 40531104

約数和(自身を除く): 19239526

約数列:

[1, 2, 7, 11, 14, 22, 49, 77, 98, 154, 539, 1078, 19751, 39502, 138257, 217261, 276514, 434522, 967799, 1520827, 1935598, 3041654, 10645789, 21291578]

約数ペア:

[(1, 21291578), (2, 10645789), (7, 3041654), (11, 1935598), (14, 1520827), (22, 967799), (49, 434522), (77, 276514), (98, 217261), (154, 138257), (539, 39502), (1078, 19751)]