20891310110 has 16 divisors (see below), whose sum is σ = 41022936432. Its totient is φ = 7596840000.

The previous prime is 20891310079. The next prime is 20891310119. The reversal of 20891310110 is 1101319802.

20891310110 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×20891310110² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20891310110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891310119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94960391 + ... + 94960610.

It is an arithmetic number, because the mean of its divisors is an integer number (2563933527).

Almost surely, 2^20891310110 is an apocalyptic number.

20891310110 is a deficient number, since it is larger than the sum of its proper divisors (20131626322).

20891310110 is a wasteful number, since it uses less digits than its factorization.

20891310110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189921019.

The product of its (nonzero) digits is 432, while the sum is 26.

Adding to 20891310110 its reverse (1101319802), we get a palindrome (21992629912).

The spelling of 20891310110 in words is "twenty billion, eight hundred ninety-one million, three hundred ten thousand, one hundred ten".