20918425

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:154

約数の個数: 48

約数和(自身を含む): 30444480

約数和(自身を除く): 9526055

約数列:

[1, 5, 11, 25, 29, 43, 55, 61, 145, 215, 275, 305, 319, 473, 671, 725, 1075, 1247, 1525, 1595, 1769, 2365, 2623, 3355, 6235, 7975, 8845, 11825, 13115, 13717, 16775, 19459, 28853, 31175, 44225, 65575, 68585, 76067, 97295, 144265, 342925, 380335, 486475, 721325, 836737, 1901675, 4183685, 20918425]

約数ペア:

[(1, 20918425), (5, 4183685), (11, 1901675), (25, 836737), (29, 721325), (43, 486475), (55, 380335), (61, 342925), (145, 144265), (215, 97295), (275, 76067), (305, 68585), (319, 65575), (473, 44225), (671, 31175), (725, 28853), (1075, 19459), (1247, 16775), (1525, 13717), (1595, 13115), (1769, 11825), (2365, 8845), (2623, 7975), (3355, 6235)]