20308055 has 12 divisors (see below), whose sum is σ = 25722072. Its totient is φ = 15390000.

The previous prime is 20308051. The next prime is 20308061. The reversal of 20308055 is 55080302.

It is not a de Polignac number, because 20308055 - 2² = 20308051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20308055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308051) 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, 3821 + ... + 7430.

It is an arithmetic number, because the mean of its divisors is an integer number (2143506).

Almost surely, 2^20308055 is an apocalyptic number.

20308055 is a deficient number, since it is larger than the sum of its proper divisors (5414017).

20308055 is a wasteful number, since it uses less digits than its factorization.

20308055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11294 (or 11275 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20308055 is about 4506.4459388747. The cubic root of 20308055 is about 272.8283167847.

Adding to 20308055 its reverse (55080302), we get a palindrome (75388357).

The spelling of 20308055 in words is "twenty million, three hundred eight thousand, fifty-five".