21003256

素因数分解:

$2^3\times {\mathrm{79}}^1\times {\mathrm{167}}^1\times {\mathrm{199}}^1$

素因数の和:451

約数の個数: 32

約数和(自身を含む): 40320000

約数和(自身を除く): 19316744

約数列:

[1, 2, 4, 8, 79, 158, 167, 199, 316, 334, 398, 632, 668, 796, 1336, 1592, 13193, 15721, 26386, 31442, 33233, 52772, 62884, 66466, 105544, 125768, 132932, 265864, 2625407, 5250814, 10501628, 21003256]

約数ペア:

[(1, 21003256), (2, 10501628), (4, 5250814), (8, 2625407), (79, 265864), (158, 132932), (167, 125768), (199, 105544), (316, 66466), (334, 62884), (398, 52772), (632, 33233), (668, 31442), (796, 26386), (1336, 15721), (1592, 13193)]