20109102 has 32 divisors (see below), whose sum is σ = 43749888. Its totient is φ = 6124896.

The previous prime is 20109073. The next prime is 20109109. The reversal of 20109102 is 20190102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6783 + ... + 9285.

It is an arithmetic number, because the mean of its divisors is an integer number (1367184).

Almost surely, 2^20109102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20109102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21874944).

20109102 is an abundant number, since it is smaller than the sum of its proper divisors (23640786).

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

20109102 is a wasteful number, since it uses less digits than its factorization.

20109102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20109102 is about 4484.3173393506. The cubic root of 20109102 is about 271.9344475104.

Adding to 20109102 its reverse (20190102), we get a palindrome (40299204).

The spelling of 20109102 in words is "twenty million, one hundred nine thousand, one hundred two".