20109550 has 24 divisors (see below), whose sum is σ = 37832400. Its totient is φ = 7951680.

The previous prime is 20109539. The next prime is 20109553. The reversal of 20109550 is 5590102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109553) 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, 2191 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (1576350).

Almost surely, 2^20109550 is an apocalyptic number.

20109550 is a deficient number, since it is larger than the sum of its proper divisors (17722850).

20109550 is a wasteful number, since it uses less digits than its factorization.

20109550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620 (or 4615 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 20109550 is about 4484.3672909341. The cubic root of 20109550 is about 271.9364669231.

Adding to 20109550 its reverse (5590102), we get a palindrome (25699652).

The spelling of 20109550 in words is "twenty million, one hundred nine thousand, five hundred fifty".