20801100 has 36 divisors (see below), whose sum is σ = 60185384. Its totient is φ = 5546880.

The previous prime is 20801089. The next prime is 20801101. The reversal of 20801100 is 110802.

It is a happy number.

It is a super-2 number, since 2×20801100² = 865371522420000, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (20801101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34369 + ... + 34968.

Almost surely, 2^20801100 is an apocalyptic number.

20801100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20801100 is an abundant number, since it is smaller than the sum of its proper divisors (39384284).

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

20801100 is a wasteful number, since it uses less digits than its factorization.

20801100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69354 (or 69347 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 20801100 is about 4560.8222942798. The cubic root of 20801100 is about 275.0186213286.

Adding to 20801100 its reverse (110802), we get a palindrome (20911902).

The spelling of 20801100 in words is "twenty million, eight hundred one thousand, one hundred".