21259964

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^2$

素因数の和:254

約数の個数: 36

約数和(自身を含む): 41721288

約数和(自身を除く): 20461324

約数列:

[1, 2, 4, 11, 22, 44, 61, 89, 122, 178, 244, 356, 671, 979, 1342, 1958, 2684, 3916, 5429, 7921, 10858, 15842, 21716, 31684, 59719, 87131, 119438, 174262, 238876, 348524, 483181, 966362, 1932724, 5314991, 10629982, 21259964]

約数ペア:

[(1, 21259964), (2, 10629982), (4, 5314991), (11, 1932724), (22, 966362), (44, 483181), (61, 348524), (89, 238876), (122, 174262), (178, 119438), (244, 87131), (356, 59719), (671, 31684), (979, 21716), (1342, 15842), (1958, 10858), (2684, 7921), (3916, 5429)]