20026 has 16 divisors (see below), whose sum is σ = 34560.
Its totient is φ = 8640.
The previous prime is 20023. The next prime is 20029. The reversal of 20026 is 62002.
Subtracting from 20026 its product of nonzero digits (24), we obtain a palindrome (20002).
Adding to 20026 its reverse (62002), we get a palindrome (82028).
20026 = 232 + 242 + ... + 412.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (20023) and next prime (20029).
It is a plaindrome in base 7.
It is a junction number, because it is equal to n+sod(n) for n = 19994 and 20021.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20021) 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, 631 + ... + 661.
It is an arithmetic number, because the mean of its divisors is an integer number (2160).
220026 is an apocalyptic number.
20026 is the 76-th nonagonal number.
20026 is the 90-th centered pentagonal number.
20026 is a deficient number, since it is larger than the sum of its proper divisors (14534).
20026 is a wasteful number, since it uses less digits than its factorization.
20026 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 69.
The product of its (nonzero) digits is 24, while the sum is 10.
The square root of 20026 is about 141.5132502630.
The cubic root of 20026 is about 27.1559335489.
The spelling of 20026 in words is "twenty thousand, twenty-six".