20971818

素因数分解:

$2^1\times 3^3\times 7^1\times {\mathrm{109}}^1\times {\mathrm{509}}^1$

素因数の和:636

約数の個数: 64

約数和(自身を含む): 53856000

約数和(自身を除く): 32884182

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 109, 126, 189, 218, 327, 378, 509, 654, 763, 981, 1018, 1526, 1527, 1962, 2289, 2943, 3054, 3563, 4578, 4581, 5886, 6867, 7126, 9162, 10689, 13734, 13743, 20601, 21378, 27486, 32067, 41202, 55481, 64134, 96201, 110962, 166443, 192402, 332886, 388367, 499329, 776734, 998658, 1165101, 1497987, 2330202, 2995974, 3495303, 6990606, 10485909, 20971818]

約数ペア:

[(1, 20971818), (2, 10485909), (3, 6990606), (6, 3495303), (7, 2995974), (9, 2330202), (14, 1497987), (18, 1165101), (21, 998658), (27, 776734), (42, 499329), (54, 388367), (63, 332886), (109, 192402), (126, 166443), (189, 110962), (218, 96201), (327, 64134), (378, 55481), (509, 41202), (654, 32067), (763, 27486), (981, 21378), (1018, 20601), (1526, 13743), (1527, 13734), (1962, 10689), (2289, 9162), (2943, 7126), (3054, 6867), (3563, 5886), (4578, 4581)]