I divisori di 20201990 sono 16, elencati qui di seguito: 1; 2; 5; 10; 167; 334; 835; 1670; 12097; 24194; 60485; 120970; 2020199; 4040398; 10100995; 20201990
20201971, 20201972, 20201973, 20201974, 20201975, 20201976, 20201977, 20201978, 20201979, 20201980, 20201981, 20201982, 20201983, 20201984, 20201985, 20201986, 20201987, 20201988, 20201989, 20201991, 20201992, 20201993, 20201994, 20201995, 20201996, 20201997, 20201998, 20201999, 20202000, 20202001, 20202002, 20202003, 20202004, 20202005, 20202006, 20202007, 20202008, 20202009