20103210 has 48 divisors (see below), whose sum is σ = 53689896. Its totient is φ = 5215104.

The previous prime is 20103203. The next prime is 20103241. The reversal of 20103210 is 1230102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17065161 + 3038049 = 4131^2 + 1743^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20103192 and 20103201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312 + ... + 6348.

Almost surely, 2^20103210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20103210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26844948).

20103210 is an abundant number, since it is smaller than the sum of its proper divisors (33586686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20103210 is a wasteful number, since it uses less digits than its factorization.

20103210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087 (or 6084 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20103210 is about 4483.6603350388. The cubic root of 20103210 is about 271.9078858357.

Adding to 20103210 its reverse (1230102), we get a palindrome (21333312).

The spelling of 20103210 in words is "twenty million, one hundred three thousand, two hundred ten".