21005420

素因数分解:

$2^2\times 5^1\times {\mathrm{863}}^1\times {\mathrm{1217}}^1$

素因数の和:2089

約数の個数: 24

約数和(自身を含む): 44198784

約数和(自身を除く): 23193364

約数列:

[1, 2, 4, 5, 10, 20, 863, 1217, 1726, 2434, 3452, 4315, 4868, 6085, 8630, 12170, 17260, 24340, 1050271, 2100542, 4201084, 5251355, 10502710, 21005420]

約数ペア:

[(1, 21005420), (2, 10502710), (4, 5251355), (5, 4201084), (10, 2100542), (20, 1050271), (863, 24340), (1217, 17260), (1726, 12170), (2434, 8630), (3452, 6085), (4315, 4868)]