20789990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{443}}^1$

素因数の和:501

約数の個数: 48

約数和(自身を含む): 42629328

約数和(自身を除く): 21839338

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 65, 95, 130, 190, 247, 361, 443, 494, 722, 886, 1235, 1805, 2215, 2470, 3610, 4430, 4693, 5759, 8417, 9386, 11518, 16834, 23465, 28795, 42085, 46930, 57590, 84170, 109421, 159923, 218842, 319846, 547105, 799615, 1094210, 1599230, 2078999, 4157998, 10394995, 20789990]

約数ペア:

[(1, 20789990), (2, 10394995), (5, 4157998), (10, 2078999), (13, 1599230), (19, 1094210), (26, 799615), (38, 547105), (65, 319846), (95, 218842), (130, 159923), (190, 109421), (247, 84170), (361, 57590), (443, 46930), (494, 42085), (722, 28795), (886, 23465), (1235, 16834), (1805, 11518), (2215, 9386), (2470, 8417), (3610, 5759), (4430, 4693)]