638637520

素因数分解:

$2^4\times 5^1\times {\mathrm{7982969}}^1$

素因数の和:7982982

約数の個数: 20

約数和(自身を含む): 1484832420

約数和(自身を除く): 846194900

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7982969, 15965938, 31931876, 39914845, 63863752, 79829690, 127727504, 159659380, 319318760, 638637520]

約数ペア:

[(1, 638637520), (2, 319318760), (4, 159659380), (5, 127727504), (8, 79829690), (10, 63863752), (16, 39914845), (20, 31931876), (40, 15965938), (80, 7982969)]