20745040

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1009}}^1$

素因数の和:1279

約数の個数: 40

約数和(自身を含む): 48467880

約数和(自身を除く): 27722840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1009, 1028, 1285, 2018, 2056, 2570, 4036, 4112, 5045, 5140, 8072, 10090, 10280, 16144, 20180, 20560, 40360, 80720, 259313, 518626, 1037252, 1296565, 2074504, 2593130, 4149008, 5186260, 10372520, 20745040]

約数ペア:

[(1, 20745040), (2, 10372520), (4, 5186260), (5, 4149008), (8, 2593130), (10, 2074504), (16, 1296565), (20, 1037252), (40, 518626), (80, 259313), (257, 80720), (514, 40360), (1009, 20560), (1028, 20180), (1285, 16144), (2018, 10280), (2056, 10090), (2570, 8072), (4036, 5140), (4112, 5045)]