639040

素因数分解:

$2^6\times 5^1\times {\mathrm{1997}}^1$

素因数の和:2014

約数の個数: 28

約数和(自身を含む): 1522476

約数和(自身を除く): 883436

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 1997, 3994, 7988, 9985, 15976, 19970, 31952, 39940, 63904, 79880, 127808, 159760, 319520, 639040]

約数ペア:

[(1, 639040), (2, 319520), (4, 159760), (5, 127808), (8, 79880), (10, 63904), (16, 39940), (20, 31952), (32, 19970), (40, 15976), (64, 9985), (80, 7988), (160, 3994), (320, 1997)]