20061 has 8 divisors (see below), whose sum is σ = 29760.
Its totient is φ = 13356.
The previous prime is 20051. The next prime is 20063. The reversal of 20061 is 16002.
Adding to 20061 its reverse (16002), we get a palindrome (36063).
It is not a de Polignac number, because 20061 - 25 = 20029 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20063) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345 + ... + 398.
It is an arithmetic number, because the mean of its divisors is an integer number (3720).
220061 is an apocalyptic number.
It is an amenable number.
20061 is a deficient number, since it is larger than the sum of its proper divisors (9699).
20061 is an equidigital number, since it uses as much as digits as its factorization.
20061 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 752 (or 746 counting only the distinct ones).
The product of its (nonzero) digits is 12, while the sum is 9.
The square root of 20061 is about 141.6368596094.
The cubic root of 20061 is about 27.1717447360.
The spelling of 20061 in words is "twenty thousand, sixty-one".