20711100 has 144 divisors (see below), whose sum is σ = 65995776. Its totient is φ = 4992000.

The previous prime is 20711099. The next prime is 20711123. The reversal of 20711100 is 111702.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158035 + ... + 158165.

It is an arithmetic number, because the mean of its divisors is an integer number (458304).

Almost surely, 2^20711100 is an apocalyptic number.

20711100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20711100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997888).

20711100 is an abundant number, since it is smaller than the sum of its proper divisors (45284676).

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

20711100 is a wasteful number, since it uses less digits than its factorization.

20711100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 20711100 is about 4550.9449568194. The cubic root of 20711100 is about 274.6214074053.

Adding to 20711100 its reverse (111702), we get a palindrome (20822802).

The spelling of 20711100 in words is "twenty million, seven hundred eleven thousand, one hundred".