20641505

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 27709440

約数和(自身を除く): 7067935

約数列:

[1, 5, 19, 31, 43, 95, 155, 163, 215, 589, 815, 817, 1333, 2945, 3097, 4085, 5053, 6665, 7009, 15485, 25265, 25327, 35045, 96007, 126635, 133171, 217279, 480035, 665855, 1086395, 4128301, 20641505]

約数ペア:

[(1, 20641505), (5, 4128301), (19, 1086395), (31, 665855), (43, 480035), (95, 217279), (155, 133171), (163, 126635), (215, 96007), (589, 35045), (815, 25327), (817, 25265), (1333, 15485), (2945, 7009), (3097, 6665), (4085, 5053)]