20001100 has 36 divisors (see below), whose sum is σ = 49604464. Its totient is φ = 6857280.

The previous prime is 20001083. The next prime is 20001139. The reversal of 20001100 is 110002.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is a self number, because there is not a number n which added to its sum of digits gives 20001100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13587 + ... + 14986.

Almost surely, 2^20001100 is an apocalyptic number.

20001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001100 is an abundant number, since it is smaller than the sum of its proper divisors (29603364).

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

20001100 is a wasteful number, since it uses less digits than its factorization.

20001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28594 (or 28587 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 20001100 is about 4472.2589370474. The cubic root of 20001100 is about 271.4467380006.

Adding to 20001100 its reverse (110002), we get a palindrome (20111102).

The spelling of 20001100 in words is "twenty million, one thousand, one hundred".