20648439

素因数分解:

$3^5\times 7^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:282

約数の個数: 48

約数和(自身を含む): 36108800

約数和(自身を除く): 15460361

約数列:

[1, 3, 7, 9, 21, 27, 61, 63, 81, 183, 189, 199, 243, 427, 549, 567, 597, 1281, 1393, 1647, 1701, 1791, 3843, 4179, 4941, 5373, 11529, 12139, 12537, 14823, 16119, 34587, 36417, 37611, 48357, 84973, 103761, 109251, 112833, 254919, 327753, 338499, 764757, 983259, 2294271, 2949777, 6882813, 20648439]

約数ペア:

[(1, 20648439), (3, 6882813), (7, 2949777), (9, 2294271), (21, 983259), (27, 764757), (61, 338499), (63, 327753), (81, 254919), (183, 112833), (189, 109251), (199, 103761), (243, 84973), (427, 48357), (549, 37611), (567, 36417), (597, 34587), (1281, 16119), (1393, 14823), (1647, 12537), (1701, 12139), (1791, 11529), (3843, 5373), (4179, 4941)]