20778505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{313}}^1$

素因数の和:417

約数の個数: 32

約数和(自身を含む): 29299968

約数和(自身を除く): 8521463

約数列:

[1, 5, 11, 17, 55, 71, 85, 187, 313, 355, 781, 935, 1207, 1565, 3443, 3905, 5321, 6035, 13277, 17215, 22223, 26605, 58531, 66385, 111115, 244453, 292655, 377791, 1222265, 1888955, 4155701, 20778505]

約数ペア:

[(1, 20778505), (5, 4155701), (11, 1888955), (17, 1222265), (55, 377791), (71, 292655), (85, 244453), (187, 111115), (313, 66385), (355, 58531), (781, 26605), (935, 22223), (1207, 17215), (1565, 13277), (3443, 6035), (3905, 5321)]