639020

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{359}}^1$

素因数の和:457

約数の個数: 24

約数和(自身を含む): 1360800

約数和(自身を除く): 721780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 359, 445, 718, 890, 1436, 1780, 1795, 3590, 7180, 31951, 63902, 127804, 159755, 319510, 639020]

約数ペア:

[(1, 639020), (2, 319510), (4, 159755), (5, 127804), (10, 63902), (20, 31951), (89, 7180), (178, 3590), (356, 1795), (359, 1780), (445, 1436), (718, 890)]