20112100 has 18 divisors (see below), whose sum is σ = 43643474. Its totient is φ = 8044800.

The previous prime is 20112073. The next prime is 20112107. The reversal of 20112100 is 121102.

It can be written as a sum of positive squares in 3 ways, for example, as 3154176 + 16957924 = 1776^2 + 4118^2 .

It is not an unprimeable number, because it can be changed into a prime (20112107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100461 + ... + 100660.

Almost surely, 2^20112100 is an apocalyptic number.

20112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112100 is an abundant number, since it is smaller than the sum of its proper divisors (23531374).

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

20112100 is a wasteful number, since it uses less digits than its factorization.

20112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201135 (or 201128 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20112100 is about 4484.6516029676. The cubic root of 20112100 is about 271.9479607769.

Adding to 20112100 its reverse (121102), we get a palindrome (20233202).

The spelling of 20112100 in words is "twenty million, one hundred twelve thousand, one hundred".