20109355 has 24 divisors (see below), whose sum is σ = 28276560. Its totient is φ = 13688640.

The previous prime is 20109343. The next prime is 20109377. The reversal of 20109355 is 55390102.

It is not a de Polignac number, because 20109355 - 2⁷ = 20109227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51501 + ... + 51889.

It is an arithmetic number, because the mean of its divisors is an integer number (1178190).

Almost surely, 2^20109355 is an apocalyptic number.

20109355 is a deficient number, since it is larger than the sum of its proper divisors (8167205).

20109355 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 20109355 = (10395502)₁₁.

20109355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20109355 is about 4484.3455486838. The cubic root of 20109355 is about 271.9355879413.

Adding to 20109355 its reverse (55390102), we get a palindrome (75499457).

The spelling of 20109355 in words is "twenty million, one hundred nine thousand, three hundred fifty-five".