20102010 has 64 divisors (see below), whose sum is σ = 49997952. Its totient is φ = 5170176.

The previous prime is 20102009. The next prime is 20102029. The reversal of 20102010 is 1020102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a self number, because there is not a number n which added to its sum of digits gives 20102010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146662 + ... + 146798.

It is an arithmetic number, because the mean of its divisors is an integer number (781218).

Almost surely, 2^20102010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20102010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24998976).

20102010 is an abundant number, since it is smaller than the sum of its proper divisors (29895942).

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

20102010 is a wasteful number, since it uses less digits than its factorization.

20102010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20102010 is about 4483.5265138058. The cubic root of 20102010 is about 271.9024754899.

Adding to 20102010 its reverse (1020102), we get a palindrome (21122112).

The spelling of 20102010 in words is "twenty million, one hundred two thousand, ten".