396940

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{223}}^1$

素因数の和:321

約数の個数: 24

約数和(自身を含む): 846720

約数和(自身を除く): 449780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 223, 356, 445, 446, 890, 892, 1115, 1780, 2230, 4460, 19847, 39694, 79388, 99235, 198470, 396940]

約数ペア:

[(1, 396940), (2, 198470), (4, 99235), (5, 79388), (10, 39694), (20, 19847), (89, 4460), (178, 2230), (223, 1780), (356, 1115), (445, 892), (446, 890)]