20311100 has 36 divisors (see below), whose sum is σ = 44533608. Its totient is φ = 8040000.

The previous prime is 20311091. The next prime is 20311103. The reversal of 20311100 is 111302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9095 + ... + 11105.

Almost surely, 2^20311100 is an apocalyptic number.

20311100 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 20311100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22266804).

20311100 is an abundant number, since it is smaller than the sum of its proper divisors (24222508).

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

20311100 is a wasteful number, since it uses less digits than its factorization.

20311100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20311100 is about 4506.7837755987. The cubic root of 20311100 is about 272.8419521083.

Adding to 20311100 its reverse (111302), we get a palindrome (20422402).

The spelling of 20311100 in words is "twenty million, three hundred eleven thousand, one hundred".