20109400 has 24 divisors (see below), whose sum is σ = 46754820. Its totient is φ = 8043680.

The previous prime is 20109379. The next prime is 20109413. The reversal of 20109400 is 490102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50074 + ... + 50473.

Almost surely, 2^20109400 is an apocalyptic number.

20109400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20109400 is an abundant number, since it is smaller than the sum of its proper divisors (26645420).

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

20109400 is a wasteful number, since it uses less digits than its factorization.

20109400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100563 (or 100554 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20109400 is about 4484.3505661355. The cubic root of 20109400 is about 271.9357907838.

Adding to 20109400 its reverse (490102), we get a palindrome (20599502).

The spelling of 20109400 in words is "twenty million, one hundred nine thousand, four hundred".