628840

素因数分解:

$2^3\times 5^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 1440000

約数和(自身を除く): 811160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 79, 158, 199, 316, 395, 398, 632, 790, 796, 995, 1580, 1592, 1990, 3160, 3980, 7960, 15721, 31442, 62884, 78605, 125768, 157210, 314420, 628840]

約数ペア:

[(1, 628840), (2, 314420), (4, 157210), (5, 125768), (8, 78605), (10, 62884), (20, 31442), (40, 15721), (79, 7960), (158, 3980), (199, 3160), (316, 1990), (395, 1592), (398, 1580), (632, 995), (790, 796)]