21387513

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{431}}^1$

素因数の和:597

約数の個数: 32

約数和(自身を含む): 34836480

約数和(自身を除く): 13448967

約数列:

[1, 3, 7, 17, 21, 51, 119, 139, 357, 417, 431, 973, 1293, 2363, 2919, 3017, 7089, 7327, 9051, 16541, 21981, 49623, 51289, 59909, 153867, 179727, 419363, 1018453, 1258089, 3055359, 7129171, 21387513]

約数ペア:

[(1, 21387513), (3, 7129171), (7, 3055359), (17, 1258089), (21, 1018453), (51, 419363), (119, 179727), (139, 153867), (357, 59909), (417, 51289), (431, 49623), (973, 21981), (1293, 16541), (2363, 9051), (2919, 7327), (3017, 7089)]