18910521

素因数分解:

$3^2\times 7^2\times {\mathrm{137}}^1\times {\mathrm{313}}^1$

素因数の和:470

約数の個数: 36

約数和(自身を含む): 32109012

約数和(自身を除く): 13198491

約数列:

[1, 3, 7, 9, 21, 49, 63, 137, 147, 313, 411, 441, 939, 959, 1233, 2191, 2817, 2877, 6573, 6713, 8631, 15337, 19719, 20139, 42881, 46011, 60417, 128643, 138033, 300167, 385929, 900501, 2101169, 2701503, 6303507, 18910521]

約数ペア:

[(1, 18910521), (3, 6303507), (7, 2701503), (9, 2101169), (21, 900501), (49, 385929), (63, 300167), (137, 138033), (147, 128643), (313, 60417), (411, 46011), (441, 42881), (939, 20139), (959, 19719), (1233, 15337), (2191, 8631), (2817, 6713), (2877, 6573)]