20991684

素因数分解:

$2^2\times 3^1\times 7^1\times {\mathrm{269}}^1\times {\mathrm{929}}^1$

素因数の和:1212

約数の個数: 48

約数和(自身を含む): 56246400

約数和(自身を除く): 35254716

約数列:

[1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84, 269, 538, 807, 929, 1076, 1614, 1858, 1883, 2787, 3228, 3716, 3766, 5574, 5649, 6503, 7532, 11148, 11298, 13006, 19509, 22596, 26012, 39018, 78036, 249901, 499802, 749703, 999604, 1499406, 1749307, 2998812, 3498614, 5247921, 6997228, 10495842, 20991684]

約数ペア:

[(1, 20991684), (2, 10495842), (3, 6997228), (4, 5247921), (6, 3498614), (7, 2998812), (12, 1749307), (14, 1499406), (21, 999604), (28, 749703), (42, 499802), (84, 249901), (269, 78036), (538, 39018), (807, 26012), (929, 22596), (1076, 19509), (1614, 13006), (1858, 11298), (1883, 11148), (2787, 7532), (3228, 6503), (3716, 5649), (3766, 5574)]