21905919

素因数分解:

$3^2\times 7^1\times {\mathrm{463}}^1\times {\mathrm{751}}^1$

素因数の和:1227

約数の個数: 24

約数和(自身を含む): 36288512

約数和(自身を除く): 14382593

約数列:

[1, 3, 7, 9, 21, 63, 463, 751, 1389, 2253, 3241, 4167, 5257, 6759, 9723, 15771, 29169, 47313, 347713, 1043139, 2433991, 3129417, 7301973, 21905919]

約数ペア:

[(1, 21905919), (3, 7301973), (7, 3129417), (9, 2433991), (21, 1043139), (63, 347713), (463, 47313), (751, 29169), (1389, 15771), (2253, 9723), (3241, 6759), (4167, 5257)]