20805814900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{390353}}^1$

素因数の和:390421

約数の個数: 72

約数和(自身を含む): 49807608984

約数和(自身を除く): 29001794084

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 41, 50, 52, 65, 82, 100, 130, 164, 205, 260, 325, 410, 533, 650, 820, 1025, 1066, 1300, 2050, 2132, 2665, 4100, 5330, 10660, 13325, 26650, 53300, 390353, 780706, 1561412, 1951765, 3903530, 5074589, 7807060, 9758825, 10149178, 16004473, 19517650, 20298356, 25372945, 32008946, 39035300, 50745890, 64017892, 80022365, 101491780, 126864725, 160044730, 208058149, 253729450, 320089460, 400111825, 416116298, 507458900, 800223650, 832232596, 1040290745, 1600447300, 2080581490, 4161162980, 5201453725, 10402907450, 20805814900]

約数ペア:

[(1, 20805814900), (2, 10402907450), (4, 5201453725), (5, 4161162980), (10, 2080581490), (13, 1600447300), (20, 1040290745), (25, 832232596), (26, 800223650), (41, 507458900), (50, 416116298), (52, 400111825), (65, 320089460), (82, 253729450), (100, 208058149), (130, 160044730), (164, 126864725), (205, 101491780), (260, 80022365), (325, 64017892), (410, 50745890), (533, 39035300), (650, 32008946), (820, 25372945), (1025, 20298356), (1066, 19517650), (1300, 16004473), (2050, 10149178), (2132, 9758825), (2665, 7807060), (4100, 5074589), (5330, 3903530), (10660, 1951765), (13325, 1561412), (26650, 780706), (53300, 390353)]