20017880

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5623}}^1$

素因数の和:5723

約数の個数: 32

約数和(自身を含む): 45554400

約数和(自身を除く): 25536520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5623, 11246, 22492, 28115, 44984, 56230, 112460, 224920, 500447, 1000894, 2001788, 2502235, 4003576, 5004470, 10008940, 20017880]

約数ペア:

[(1, 20017880), (2, 10008940), (4, 5004470), (5, 4003576), (8, 2502235), (10, 2001788), (20, 1000894), (40, 500447), (89, 224920), (178, 112460), (356, 56230), (445, 44984), (712, 28115), (890, 22492), (1780, 11246), (3560, 5623)]