19993985

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^3\times {\mathrm{53}}^1$

素因数の和:126

約数の個数: 32

約数和(自身を含む): 28149120

約数和(自身を除く): 8155135

約数列:

[1, 5, 11, 19, 53, 55, 95, 209, 265, 361, 583, 1007, 1045, 1805, 2915, 3971, 5035, 6859, 11077, 19133, 19855, 34295, 55385, 75449, 95665, 210463, 363527, 377245, 1052315, 1817635, 3998797, 19993985]

約数ペア:

[(1, 19993985), (5, 3998797), (11, 1817635), (19, 1052315), (53, 377245), (55, 363527), (95, 210463), (209, 95665), (265, 75449), (361, 55385), (583, 34295), (1007, 19855), (1045, 19133), (1805, 11077), (2915, 6859), (3971, 5035)]