638080

素因数分解:

$2^7\times 5^1\times {\mathrm{997}}^1$

素因数の和:1016

約数の個数: 32

約数和(自身を含む): 1526940

約数和(自身を除く): 888860

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 997, 1994, 3988, 4985, 7976, 9970, 15952, 19940, 31904, 39880, 63808, 79760, 127616, 159520, 319040, 638080]

約数ペア:

[(1, 638080), (2, 319040), (4, 159520), (5, 127616), (8, 79760), (10, 63808), (16, 39880), (20, 31904), (32, 19940), (40, 15952), (64, 9970), (80, 7976), (128, 4985), (160, 3988), (320, 1994), (640, 997)]