21620529

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{347}}^1$

素因数の和:426

約数の個数: 48

約数和(自身を含む): 38218752

約数和(自身を除く): 16598223

約数列:

[1, 3, 7, 9, 21, 23, 43, 63, 69, 129, 161, 207, 301, 347, 387, 483, 903, 989, 1041, 1449, 2429, 2709, 2967, 3123, 6923, 7287, 7981, 8901, 14921, 20769, 21861, 23943, 44763, 55867, 62307, 71829, 104447, 134289, 167601, 313341, 343183, 502803, 940023, 1029549, 2402281, 3088647, 7206843, 21620529]

約数ペア:

[(1, 21620529), (3, 7206843), (7, 3088647), (9, 2402281), (21, 1029549), (23, 940023), (43, 502803), (63, 343183), (69, 313341), (129, 167601), (161, 134289), (207, 104447), (301, 71829), (347, 62307), (387, 55867), (483, 44763), (903, 23943), (989, 21861), (1041, 20769), (1449, 14921), (2429, 8901), (2709, 7981), (2967, 7287), (3123, 6923)]