21187420

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9719}}^1$

素因数の和:9837

約数の個数: 24

約数和(自身を含む): 44906400

約数和(自身を除く): 23718980

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9719, 19438, 38876, 48595, 97190, 194380, 1059371, 2118742, 4237484, 5296855, 10593710, 21187420]

約数ペア:

[(1, 21187420), (2, 10593710), (4, 5296855), (5, 4237484), (10, 2118742), (20, 1059371), (109, 194380), (218, 97190), (436, 48595), (545, 38876), (1090, 19438), (2180, 9719)]