20111002110 has 128 divisors (see below), whose sum is σ = 55129196160. Its totient is φ = 5214763008.

The previous prime is 20111002097. The next prime is 20111002117. The reversal of 20111002110 is 1120011102.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20111002092 and 20111002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111002117) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1610812 + ... + 1623248.

It is an arithmetic number, because the mean of its divisors is an integer number (430696845).

Almost surely, 2^20111002110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111002110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27564598080).

20111002110 is an abundant number, since it is smaller than the sum of its proper divisors (35018194050).

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

20111002110 is a wasteful number, since it uses less digits than its factorization.

20111002110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12619 (or 12613 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111002110 its reverse (1120011102), we get a palindrome (21231013212).

The spelling of 20111002110 in words is "twenty billion, one hundred eleven million, two thousand, one hundred ten".