20436100 has 18 divisors (see below), whose sum is σ = 44346554. Its totient is φ = 8174400.

The previous prime is 20436089. The next prime is 20436103. The reversal of 20436100 is 163402.

It can be written as a sum of positive squares in 3 ways, for example, as 3936256 + 16499844 = 1984^2 + 4062^2 .

It is not an unprimeable number, because it can be changed into a prime (20436103) 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, 102081 + ... + 102280.

Almost surely, 2^20436100 is an apocalyptic number.

20436100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20436100 is an abundant number, since it is smaller than the sum of its proper divisors (23910454).

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

20436100 is a wasteful number, since it uses less digits than its factorization.

20436100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204375 (or 204368 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20436100 is about 4520.6304870007. The cubic root of 20436100 is about 273.4005221833.

Adding to 20436100 its reverse (163402), we get a palindrome (20599502).

The spelling of 20436100 in words is "twenty million, four hundred thirty-six thousand, one hundred".