21070775

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{193}}^1\times {\mathrm{397}}^1$

素因数の和:611

約数の個数: 24

約数和(自身を含む): 28722864

約数和(自身を除く): 7652089

約数列:

[1, 5, 11, 25, 55, 193, 275, 397, 965, 1985, 2123, 4367, 4825, 9925, 10615, 21835, 53075, 76621, 109175, 383105, 842831, 1915525, 4214155, 21070775]

約数ペア:

[(1, 21070775), (5, 4214155), (11, 1915525), (25, 842831), (55, 383105), (193, 109175), (275, 76621), (397, 53075), (965, 21835), (1985, 10615), (2123, 9925), (4367, 4825)]