20105212110 has 32 divisors (see below), whose sum is σ = 48306972672. Its totient is φ = 5355338400.

The previous prime is 20105212109. The next prime is 20105212147. The reversal of 20105212110 is 1121250102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20105212110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351166 + ... + 404385.

It is an arithmetic number, because the mean of its divisors is an integer number (1509592896).

Almost surely, 2^20105212110 is an apocalyptic number.

20105212110 is an abundant number, since it is smaller than the sum of its proper divisors (28201760562).

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

20105212110 is a wasteful number, since it uses less digits than its factorization.

20105212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756448.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20105212110 its reverse (1121250102), we get a palindrome (21226462212).

The spelling of 20105212110 in words is "twenty billion, one hundred five million, two hundred twelve thousand, one hundred ten".