20210 has 16 divisors (see below), whose sum is σ = 38016.
Its totient is φ = 7728.
The previous prime is 20201. The next prime is 20219. The reversal of 20210 is 1202.
It is an interprime number because it is at equal distance from previous prime (20201) and next prime (20219).
It is a Harshad number since it is a multiple of its sum of digits (5).
It is a nialpdrome in base 12.
It is a junction number, because it is equal to n+sod(n) for n = 20194 and 20203.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20219) 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, 407 + ... + 453.
It is an arithmetic number, because the mean of its divisors is an integer number (2376).
220210 is an apocalyptic number.
20210 is a deficient number, since it is larger than the sum of its proper divisors (17806).
20210 is a wasteful number, since it uses less digits than its factorization.
20210 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 97.
The product of its (nonzero) digits is 4, while the sum is 5.
The square root of 20210 is about 142.1618795599.
The cubic root of 20210 is about 27.2388501926.
Adding to 20210 its reverse (1202), we get a palindrome (21412).
It can be divided in two parts, 202 and 10, that added together give a palindrome (212).
The spelling of 20210 in words is "twenty thousand, two hundred ten", and thus it is an iban number.